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XXXII.—On a smallcollection of Polychætafrom UruguayC.C.A. Monro M.A. aa Department of Zoology, BritishMuseum (Natural History)

Version of record first published: 17 Aug2009.

To cite this article: C.C.A. Monro M.A. (1938): XXXII.—On a smallcollection of Polychæta from Uruguay , Journal of Natural History Series11, 2:9, 311-314

To link to this article: http://dx.doi.org/10.1080/00222933808526850

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On Polychseta from Uruguay. 311

S. India, Biligirirangan Hills, Dhimbam, 28. iv. 37 (G. M. Henry), in the Colombo Museum ; paratype ~, Calcutta, in British Museum.

In general appearance this species closely resembles Nothochrysa Gequalis (Walker), but the wings are a little broader. The ~ genitalia, although they are of the same general pattern, are amply distinct, and I take this opportunity of figuring those of Walker's type. In mqualis (figs. 10-15), the anal plates are produced at their lower apical angles in broad rounded lobes. The apex of the fused eighth and ninth sternites bears a membranous flap closely set with black set~e. The parameres are shorter and not serrate, and the tenth sternite and mdeagus have a different form. Nothochrysa 8equalis appears to be more widely distributed than N. henryi, occurring in N. India, Bengal, Federated Malay States, Sumatra, Java, Borneo, and Philippines.

X X X I I . - - O n a Small Collection of Polychxta from Uruguay. By C. C. A. MoN~o, M.A., Assistant Keeper in the Department of Zoology, British Museum (Natural History).

DR. ERGASTO H. COaDERO of Montevideo has had the kindness to send me a few Polych~etes collected at the mouth of the River Plate. Among them is a brackish water Spionid which I have described as a new species.

Genus POLYDORA Bose.

Polydora uncatiJbrmis, sp. n.

Occurrence.---Arroyo de las Brujas, Canelones, Uruguay. The animals live in brackish water among tubes of Mercierella enigmatica Fauve, l.

Description.--The material is in poor condition. This is a small species, the largest specimen measuring about 5 mm. by 1 mm. at the widest part for c. 40 chmtigers. The body is somewhat flattened dorso-ventrally in the front region, and is anteriorly rather wide relatively to its length. There are traces of black transverse markings

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Fig. 3.

Mr. C. C. A. Monro o n

on the dorsum. The head is emarginate in front and there are two pairs of eyes. The anterior pair lie just behind the insertion of the palps and are separated by twice the distance dividing the binder pair. The pro- stomial keel is continued backwards to the third chaetiger.

The first chmtiger carries ventral capillary bristles, but no dorsal bristles. The branchim begin at the second ehmtiger, are absent from the fifth and probably the

0"01MM. [

Fig. 1.

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Fig. 2.

1 O'OZMM

I Polydora uncatiformis, sp. n.

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312

Fig. 1.--Ventral crochet. Fig. 2 . - -Hook from modified fifth chzetiger. Fig. 3.--Posterior dorsal hook.

sixth chmtiger and, as far as can be seen, are continued over about the anterior three-fourths of the body. They are very small in front of the modified fifth chzetiger, but in the middle region are long enough to meet across the back. The relation between the gill and the pedal lamella cannot be made out. In the anterior region there are both dorsal and ventral capillary bristles. The hooded

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Polychteta from Uruguay. 313

ventral crochets (fig. 1) first appear at the seventh ch~etiger. They are about four in number and have simple bidentate tips. The modified fifth ch~etiger carries about six plain hooks without secondary processes (fig. 2), and one or two lanceolate ch~et~e. About tile last twelve ch~etigers carry a single large dorsal hook (fig. 3), with a subterminal enlargement of the shaft. This posterior hook-bearing area is abranchiate. The pygidium is damaged and I cannot make out its precise structure. I t appears to consist of a small rounded lobe with a pair of small lateral cirri.

Remarks.--This species is close to Polydora (Boccardia) uncata Berkeley (1927, p. 14) described by Berkeley from Vancouver Island, and afterwards by Okuda (1937, p. 238) from Japan. In fact, so closely do these specimens agree with Berkeley's account that I hesitated to make the separation, but the present form differs greatly in size, being much smaller than Berkeley's species, and in the arrangement of the anterior eyes ; and it also appears to occupy a very different habitat.

I t is noteworthy that Polydora amarincola Hartman (1936, p. 49), which occupies a very similar habitat among tubes of Mercierella enigmatica Fauvel in the brackish waters of Lake Merritt, Oakland, California, is a very different species, with branchiae beginning on the eighth segment and no posterior dorsal hooks. Hartman's species was also taken in the Oakland estuary and in San Francisco Bay. I t appears to be euryhaline, as is also Polydora brachycephala Hartman.

G e n u s ~EREIS Cuvier.

Nereis succinea (Leuckart). Fauvel, 1936, p. 312.

Occurrence.--Playa de las Flores, Maldonado, Uruguay, under stones on the beach (8). Rio de la Plata, coast of Montevideo, under stones on sand (10).

Distribution.--North Sea, Atlantic, Mediterranean East coast of America, Panama Region, California.

Remarl~s.--Treadwell (1925, p. 1)described a N~reis (Neanthes) australis from off Punta del Este, Maldonado, Uruguay, which I believe to be identical with this species.

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314 Mr. G. E. J. Nixon on

REFERENCES. BERKELEY, E. 1927. " P o l y c h e e t o u s Anne l ids f rom t h e N a n a i m o

Dis t r ic t . P a r t 3." Contr . Canad ian Biol. a n d F isher . N.S. iii. (17), pp . 407-422, pl. i.

FAUVEL, P. 1936. " R e m a r q u e s sur les N~r~idiens Nereis succinea (Leuckar t ) e t Nereis lamellosa Ehle rs . " Bull. Soc. Zool. F rance , lxi. pp. 307-314.

H),RTMAN, O. 1936. " New Species of Spionidm (Annel ida Polychseta) f rom t h e Coast of California." Univ . California Publ . in Zool. xti. {6), pp . 45-52, 22 text-f igs.

O~:[TDA, S. 1937. " Spioniform Polychmtes f rom J a p a n . " J . Sci. Hok- kaido I m p . Univ . ser. vi. Zool. v. (3), pp. 217-253, 27 text-f igs.

TREADWELL, A . L . 1925. " T h e He te roaere i s P h a s e of a new Species of a Polych~etous Amlel id f r o m U r u g u a y . " Prec . U.S. Nat . Mus. lxiv. (9), pp . 3, 1 pl.

X X X I I I . - - T w o new Oriental Species of Macrocentrus (Hym., Brae.). By G. E. J. NIxoN, B.A., Imperial Insti tute of Entomology.

THE tWO following species are introduced as new chiefly because a name has been urgently requested for the first- mentioned of them. I can find no description of Oriental forms with which they exactly agree. In view of the fact, though, that the species of Macrocentrus are known to be very variable in eolour and the older descriptions are usually inadequate to permit of determination on structure, I can not be certain that these two species really are unknown to science. On the other hand, and considering how few Macrocentrus have been described from the Old World, it is very probable that many species await discovery.

In describing the two forms below, both of which have been bred from known hosts, I have obtained much help from Muesebeck's revision (1932) of the Nearctic species of the genus; it seems to me to be the only critical contribution to the taxonomy of Macrocentrus that has ever been written.

Subfamily M~C~OCSNrR±NA~.

Macrocentrus homonx, sp. n.

~ . Head and abdomen black. Thorax clear reddish- brown except propodeum, which is black, and postscutellum together with the apical margin of the scutellum, which

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