ZOOLOGY AND BOTANY, MIOEOSOOPY. ETC. 55 



Vermes. 

 a. Annelida. 



Polychseta of Dinard.* — The Baron de Saint- Joseph continues his 

 account of the j)olychaetous Annelids found off Dinard. The Aphro- 

 ditinge often carry ectoparasites, thus Pedicellina belgica may be found 

 under the elytra and on the back of Hermadion pelluddum, and Trichodina 

 Auerhachii has been found on the elytron of Halosydna gelatinosa ; 

 numerous other cases are cited. These same worms may also live an 

 epizoic life, thus Mahigrenia castanea lives near the mouth of Spatangus 

 purpureus, Hermadion assimile lives round that of Echinus esculentus, and 

 Acholoe astericola lives in the ambulacra of various species of Astropecten. 

 The Polynoids appear to be specially commensal on other annelids. 



The author's account of the various species differs considerably in 

 length ; among those most fully treated are Halosydna gelatinosa, 

 Harmothoe cceliaca sp. n. ; H. maxillospinosa sp. n., H. picta sp. n., and 

 H. arenicolse sp. n., the last of these was found on an Arenicola marina. 



The EuniceidsB are next dealt with ; the members of this family are 

 interesting from the differences between the young and old forms, due to 

 successive modifications in the setse, jaws, number of eyes and cephalic 

 appendages ; in consequence of this, great care must be taken in the 

 definition and delimitation of species. Lumbriconereis labrofimhriata and 

 L. paradoxa are new. The name of Labrorostratus is given to a new 

 genus in which the head has no appendages and the uj^per jaw is rudi- 

 mentary, and which is allied to Arabella. From its habit the species is 

 called L. parasiticus ; it was found living in the body-cavity of Syllidians ; 

 it is not known how it reaches this situation. It is remarkable for its 

 comparatively large size, being as much as 8 mm. long. A somewhat 

 similar case of endoparasitism is the Lumbriconereis found in MarpJiysa. 

 The characters of Claparede's genus Drilonereis are modified, and a 

 new species, D. macrocepliala, is described. The characters of Arabella 

 are also emended, and Maclovia is regarded as a sub-genus. The 

 same happens to Paractius. A remarkable new form, P. mutabilis, is 

 described. 



Among the Lycoridinse Leptonereis Vaillanti sp. n. and its heteronereid 

 forms are first described. The author does not agree with Claparede's 

 view that only some of the species of Nereids have heteronereid forms ; 

 of the thirty-eight of the latter, twenty are known to have nereid forms, 

 and he does not think it unlikely that others will be discovered. 



The PhyllodocinsB are next discussed ; the genus PJiyllodoce is 

 divided into the four sub-genera, Gensetyllis, PJiyllodoce (s. str.), Anaitis, 

 and Carobia. 



PJiyllodoce (Carobia) splendens sp. n. is perhaps the most beautiful 

 annelid found at Dinard. It has a yellowish brown head, the appendages 

 of the head are yellow, and the cirri of a beautiful green, edged with 

 yellow; the dorsal surface of the segments has a yellow background 

 covered with a metallic azure with beautiful iridescence ; the lower 

 surface is deep brown with thin longitudinal rays of blue. Another new 

 species is P. (Carobia) rubiginosa. JEulalia Claparedii, E. splendens, E. 

 ornata, E. trilineata, E. rubiginosa, E. fuscescens, E. venusta, and E. parva 

 are new. Other new species are Etione incisa, and Mystides (^Meso- 

 mystides) limbata. The last group treated of is that of the Hesioninte. 



* Aun. Sci. Nat., v. (1888) pp. 141-338 (8 pis.). 



