14 EEV. T. E. E. STEBBING— BISCAYAN PLANKTON : 



AmPHIPODA, CliADOCEUA, AND A LARVAL ThYROSTRACAN 



FROM THE Bat of Biscay. 



The small crustaceans whicli form the subject of the present report, when entrusted to 

 my examination by Dr. G. H. Eowler, were contained in 121 tubes, and have proved to 

 belong to 29 distinguishable, if not in every case determinable, species. Pour of these 

 are Amphipoda Gammaridea, nineteen Amphipoda Hyperiidea, two Cladocera, two 

 Ostracoda (discussed elsewhere), one the larva of aCirripede, and one an Isopod, probably 

 belonging to the genus Earycope, but too fragmentary for determination. One of tlie 

 Gammarids, though clearly distinct from the rest, was too imperfect for description. 

 Of the remaining Gammarids one is a very common and one a rare species; the 

 third is new and supplies the representative of au interesting new genus. Among the 

 Hyijeriids the family Scinidse is represented by no less thau eight species, two of them 

 requiring the institution of new genera. In the family of the Hyperiidte, JSyperioides 

 longipes, Chevreux, calls for special remark. It far exceeds in the number of its 

 occurrences and in number of specimens any other species of Amphipoda in this 

 collection. Yet this apparently common form was not described, at any rate from the 

 Atlantic, until the year 1900. To the description by Chevreux speedily followed an 

 obviously independent account by Dr. Vosseler, and now in qviick succession the same 

 species appears as a predominant constituent of Dr. Powler's collections. 



The present opportunity has been taken for making more generally known the characters 

 of the juvenile Frimno among the Hyperiids, and the external appearance of the Cypris- 

 larva of Lepas pectinata among the Thyrostraca. 



AMPHIPODA GAMMARIDEA. 

 Pam. LTSIANASSIDiE. 



Cyphocaris, Boeck, 1871. 



1871. Cyphocaris, Boeck, Vid.-Selsk. Forhandl. (Christiania) for 1870, p. 103 (23). 

 1888. Cyphocaris, Stebbing, 'Challenger' Amphipoda, Reports, vol. xxix. pp. 398,656. 

 1900. Cyphocaris, Chevreux, Amphipodes de I'Hirondelle, p. 165. 



It does not appear that Liitken took any part in the definition of this genus, although, 

 according to Boeck, he chose its name. It was therefore, as I now think, an error of 

 judgment on my part to name Liitken and Boeck as joint founders of the genus. 



1. Cyphocaris anonyx, Boeck. 



1871. Cyphocaris anonyx, Boeck, Vid.-Selsk. Forhandl. (Christiania) for 1870, p. 104 (24). 



1872. Cyphocaris anonyx, Boeck, Skand. og Arkt. Amphipoder, vol. i. p. 141, pi. 6. fig. 1. 



1888. Cyphocaris micronyx, Stebbing, ' Challenger' Amphipoda, Reports, vol. xxix. p. 656, pi. 16. 



1890. Cyphocaris jrn'croreya;, Chevreux, Amphipodes de THirondelle, p. 165. 



1903. Cyphocaris anonyx, A. O. Walker, Ann. & Mag. Nat. Hist. ser. 7, vol. xii. p. 232, pi. 18. fig. 14. 



The points in which the descriptions of C. anonyx and C. micronyx differ are fully 

 sufficient for specific distinction, but they seem little worth insisting on until fresh 

 specimens have been obtained corroborating the earliest description. C. anonyx was found 



