Corophium 687 



2. C. nobile 0. Sars 1895 C. n., G. 0. Sars in: Bull. Ac. St.-Petersb., ser.5 v.3 

 p. 292 t. 20, 21 j 1896 C. «., Sowinski in: Mem. Soc. Kiew, v. 15 p. 375. 



Segments of pleon distinct. Head witb short broad triangulär rostrum. 

 Side-plate 1 the largest, produced forward to a narrowly rounded lobe, carrving 

 many setae, some of tbem plumose. Eyes small, rounded, dark; Visual 

 elements seeming to be imperfectly developed. Antenna 1 very slender, 

 in ö more than half as long as body, rather longer than in Q ; peduncle 

 setose, densely in ö ; 1^* Joint not quite so long as 2'^ and 3^ combined, 

 with 2 teeth on lower margin; 3'^ Joint scarcely more than half as long as 2^; 

 flagellum with about 20joints, filiform, in 9 subequalto peduncle, in ö longer. 

 Antenna 2 subpediform, in ö more than % as long as body, much smaller 

 in 9 ; first 2 joints coalesced, as long as 3^; penultimate Joint of peduncle 

 large, tumid in d, in both sexes produced into 2 strong teeth, the outer 

 the longer; ultimate Joint sublinear, much shorter than penultimate, a somewhat 

 recurved tooth of its lower margin adapted to pass between the 2 apical 

 teeth of the penultimate; flagellum not quite as long as ultimate Joint of 

 peduncle, setose, with 1 long and 2 very short joints, the last tipped 

 with 2 curved spines. Upper lip somewhat quadrate with dentiform 

 projection from surface. Gnathopods 1 and 2 as in C. volutator. Peraeopods 1 

 and 2 comparatively slender; 2'^ Joint slightly expanded, 4^^ subequal to 5*'' and 

 6*"^ combined, its front margin in d fringed with long diverging setae, 6*^ very 

 narrow, conically tapering, finger subequal to it, slender, acute. Peraeopod 3, 

 2^ Joint narrowly oval, bind margin straight, almost smooth, 4*^ with front 

 apex produced, 5**^ with 2 oblique rows of curved spines on the outer side, 

 the lower row of 6 ending at the produced bind corner; 6**^ Joint longer, 

 linear; finger short, curved. Peraeopod 4 similar, but with longer joints 

 and bind margin of 2^ curved, fringed with plumose setae. Peraeopod 5 

 much longer, more than half as long as body; 2<^ Joint broadly oval, narrowest 

 distally, densely setose, 4*^ — 6*^ linear, 6^^ the lougest; finger short, curved, 

 acute. Uropods 1 — 3 as in C. volutator. Telson transversely truncate. 

 Colour, dark brown in bands or mottled; antenna 2 obliquelv banded. 

 L. 9 10, Ö 11 mm. 



Caspian Sea. Depth to about 75 m. 



3. C. chelicorne 0. Sars 1895 C. c, G. 0. Sars in: Bull. Ac. St.-Petersb., ser.5 

 V. 3 p. 299 t. 22. 



Pleon Segments distinct, divisiou between 5*^ and 6^^ rather obscure. 

 Head, front convex, with out rostrum. Side-plate 1 with only 3 slender setae 

 at apex. Eyes very small, rounded, dai-k. Antenna 1 rather short, in Q only 

 about 7.S ^s long as body, sparingly setose; 1^* Joint as long as 2^ and 

 3^ combined, with about 7 spinules on lower margin in o, not in d; 

 2^ Joint more than twice as long as 3^ in d, not in 9 ; flagellum shorter than 

 peduncle, with 15 joints in d, 10 in 9. Antenna 2 strong, in d % as long 

 as body; the large penultimate Joint of peduncle with small inner tooth at 

 apex, and an outer tooth produced to the end of ultimate Joint, which is only 

 about half as long as penultimate and has a short stout recurved prominence 

 below middle of lower margin and a strong apical tooth, capable of crossing 

 the chela-forraing tooth of penultimate; flagellum 3-jointed, subequal to 

 ultimate Joint of peduncle. Gnathopods 1 and 2 as in 0. volutator. Peraeo- 

 pods 1 and 2, 4^'* Joint rather longer than b^^ and 6^^ combined, 5*^ veiy 

 Short, 6*^ not quite linear, finger rather shorter. Peraeopods 3 and 4 

 as in 0. nobile. Peraeopod 5, 6*'' Joint nearly twice as long as 5*^. Uropods 



