of the North Atlantic and of North-Western Europe. 689 



5. Conchoecia spinirostris, Claus. 

 (PI. LX., fig. 22.) 



1874. Conchoecia spinirostris, . . Claus "Schrif ten zoologisch en Inhalts.i. Heft., 



DieFamilie des Halocypriden," p. 6, pi. i,, 

 figs. 1, 6a, 8 ; pi. ii., figs. 11, 14, 15. 



1887. ,, pellucida, . . Sars, G. 0., " Nje Bidrag til Kundskaben om 



Middelhavets Invertebratfauna : iv. Ostra- 

 coda Mediterranea," p. 80, pi. xi., figs. 

 1-4; pi. xii. ; pi. siii., figs. 1-4. 



1890. ,, spinirostris, . . Claus, " Die Gattungen und Arten dei mediter- 



ranen und atlantischeu Halocypriden," p. 7. 



1891. „ ,, . . Claus, "Die Halocypriden des atlantischen 



Oceans und Mittelmeeres," p. 56, pi. i., 

 figs. 1-12. 

 1894. ,, ,, . . MtJLLER, G. W., "Die Ostracoden des Golfes 



von Neapel.," p. 237, pi. 6, figs. 1-9, 13. 



Shell, seen laterally, oblong, pellucid, about twice as long as high ; in the 

 female, lower in front than at the feebly rounded hinder end; in the male, 

 relatively higher, and with a straight posterior margin. Rostral sinus having a 

 delicately serrated marginal membrane from which springs a fine bristle. Frontal 

 tentacle of the female straight, slender, finely acuminate, that of the male 

 angularly bent and clubbed at the capitulum. Principal seta of the male antennule 

 scarcely longer than the adjacent ones, and having only eight or ten pairs of 

 hooked marginal appendages (fig. 22) following which, but separated by wide 

 intervals, are some hook-like processes of irregular size. The lower sensory 

 filament is at least thrice as long as the upper. Hooked appendage of the 

 secondary branch of the right male antenna strongly angulated. The five sensory 

 filaments of the female antenna, with the exception of the very large principal 

 seta, about equal in length. Proximal joint of the mandible-palp much elongated, 

 longer than the three following joints. Ungues of the caudal laminae curved only 

 towards the points, and separated by considerable intervals from one another ; the 

 last four very small. 



This species, according to Claus, is widely distributed at the surface in the 

 Mediterranean, and has been taken also in the Adriatic at Trieste. The 

 specimens described by G. 0. Sars, under the specific name pellucida, were taken 

 at Messina. 



