18/1.] MR. O. S. BRADY ON EUROPEAN CYPRI DIN ID.E. 289 



Head longer than broad ; occipital process three times as long as 

 wide at its base. Free portion of tail twice as long as high. Tho- 

 racic adhesive apparatus lozenge-shaped. 



Lips roughened, not fringed ; maxillary barbels reach to below 

 the posterior margin of the orbit, the nasal ones short, the outer 

 mandibular pair do not reach the gill-opening, but they are longer 

 than the internal mandibular pair. 



Fins. Dorsal nearly as high as the body, its spine slender, its 

 osseous portion being two-thirds as long as the head ; base of adipose 

 fin as long as that of the first dorsal, and equalling two-fifths of the 

 distance between the two fins. Pectoral spine broad and strongly 

 denticulated, extending two-thirds of the distance to the base of the 

 ventral. Caudal deeply forked. 



Air-bladder in two rounded lateral portions, very thin, and en- 

 tirely enclosed by bone. ■ 



Colours. Blackish brown. Fins yellowish, with black bands. 

 Caudal black, with yellow margins. 



The G. trilineatum, Blyth, is distinct from this species, and ap- 

 parently identical with that described by Dr. Giinther. The speci- 

 mens in the Calcutta Museum do not appear to have comprised Mr. 

 Blyth's typical example ; but a G. trilineatum has lately been received 

 from Rangoon. 



3. A Review of the Cypridinidte of the European Seas, with 

 Description of a new Species. By George Stewardson 

 Brady, C.M.Z.S. 



[Keeeived March 29, 1871.1 



(Plates XXVI. & XXVII.) 



Dr. G. O. Sars, in a memoir published in 1869*, expressed his 

 belief that two well-known Cypridinidse, heretofore considered as 

 belonging to entirely distinct genera, are in fact merely the male 

 and female of the same species, — Philomedes lonyicornis (Lilljeborg) 

 representing the male, and Bradycinetus brenda (Baird) the female. 

 He also, in the same place, propounded a similar view as regards 

 Cypridina marine (Baird) and C. teres (Norman). The latter pro- 

 position seemed to present no very great difficulty ; but as regards the 

 former several almost insurmountable obstacles presented themselves 

 to my mind. Thus a male form of Bradycinetus brenda, quite 

 distinct from Philomedes lonyicornis, and nearly approaching in 

 shape to the female, had already been described by Sars himself; 

 so that the new theory involved the supposition of two distinct males ; 

 then the structure and shape of the shell in B. brenda and P. lonyi- 

 cornis are widely different ; and, lastly, while (the male) P. longi- 



* Undersogelser over Cbristianiafiordens Dybvandsfauna anstillede paa en i 

 Sommeren 1868 foretagen Zoologisk Eelse. 



Proc. Zool. Soc— 1871, No. XIX. 



