Carinogammarus 505 



slender, nearly half as long as body, P* joiut siibequal to 2*^ and 3^ combined,. 

 flagellum longer than peduncle, accessoiy flagellum 5-jointed. Antenna 2 

 much shorter, ultimate Joint of peduncle shorter than penultiniate, flagellum 

 about lü-jointed. Gnathopods 1 and 2, 5^*^ Joint short, cup-shaped, ü^^ oblong 

 oval, palm somewhat oblique, shorter than hind margin. defined by obtuse; 

 angle with strong spine; gnathopods stronger in ö than in Q, and gnathopod 2 

 considerably larger than gnathopod 1. I^raeopod 1 longer than peraeopod 2. 

 Peraeopod 3 shorter than 4 and 5, 2*^ Joint little longer than broad, slightly 

 narrowed distally. Peraeopod 4, 2"^ Joint longer, distally more narrowed. 

 Peraeopod 5, 2^ Joint longer, oblong quadrangular, hind margin as in peraeopods 

 3 and 4 serrate. üropods 1 and 2, rami subequal, with lateral and apical 

 spines. Uropod 3 reachiug much beyond the others, short peduncle with 4 

 spines on apical margin, outer ramus nearly thrice as long as peduncle, fringed 

 round with long plumose setae, 2*^ Joint minute; inner ramus scale-like^ 

 V2 as long as peduncle, with 1 spinule on inner margin and 1 on apex. 

 Telson scarcely so long as broad, each subconical lobe with 2 spinules and 

 some hairs on the obliquely ti'uncate apex. L. 9 13, d 16 mm. 



Caspian Sea. Deptli 1 — 37 ni. 



7. C. atchensis (F. Brandt) 1851 Gammarus a., F. Brandt in: Middendorff, 

 Keise Sibirien. v.2i p. 138 t. 6 f. 29 | 1862 G. a., Batc, Cat. Amphip. Brit. Mus., p. 217 

 t. 38 f. 7 j 18w9 Carinogammarus a.. T. Stebbing in: Tr. Linn. Soc. London, ser. 2 v.7 

 p. 430 I 1893 Melita palmata (part.)?, A. Della Valle in: F. Fl. Neapel, «.20 p. 765. 



Peraeon segments 1 — 3 dorsally rounded, segments 4 and 5 obscurely,. 

 6 and 7 feebly carinate; pleon segments 1 — 3 pretty strongiy carinate, 

 Segment 4 slightly carinate in front, hehind. like segments 5 and 6, rounded; 

 segments 1 — 3 with rows of spinules on hind margin, and between these and 

 the carina-tooth a low eminence also beset with rows of spinules; segment 4 

 with 2 curved eminences on each side, pectinate with 4- 7 spinules; segment 5 

 with 1 or 2 or even 3 such eminences, carrying 6 or 7 or fewer spinules^ 

 segment 6 with a front inner very small pair of eminences, and a more 

 spiny outer larger pair behind. Head, rostrum very short. Eyes long elliptic 

 or somewhat reuiform. Antenna 1 scarcely half as long as body, flagellum 

 longer than peduncle, 33-jointed, accessory flagellum 7-jointed, about ^/^ as 

 long as primary. Antenna 2 shorter, flagellum 19-jointed. Gnathopods 1 and 2 

 subequal, or gnathopod 1 rather the larger, b^^ Joint short, cup-shaped, 

 6^'» rhomboidal, -little longer than broad, a little widened to the palm, 

 which is furnished with little teeth or spines and obliquely truncate in. 

 gnathopod 1, but almost transverse in gnathopod 2. Peraeopods 1 — 5 stoutly 

 built, rather short, with fascicles of spines but few setae. Üropods 1 and 2,. 

 rami short, broad, strong and spinöse, üropod 3 as long as the preceding 

 or longer, rami spinöse, lanceolate, inner not half as long as outer, scale- 

 like (in figure). Telson cleft to the base, as long as short peduncle of uropod 3, 

 each subconical lobe with 3 spinules at apex. L. 25 mm. (According to 

 Brandt; Bäte differs in many respects.) 



Behring Sea (Isles of Aicha and Unalaschka). 



8. C. subearinatus (Bäte) 1862 Gammarus s. (Stimpson in MS.), Bäte, Cat. 

 Amphip. Brit. Mus., p. 205 t. 36 f. 5 | 1899 Carinogammarus s., T. Stebbing in: Tr. Linn. 

 Soc. London, ser. 2 v.7 p. 430 | 1893 Gammarus marinus (part.)?, A. Della Valle in: 

 F. Fl. Neapel, v. 20 p. 76«. 



Pleon segments 1 — 3 having the dorsal median line slightly elevated 

 into a carina, with a fascicle of short spines on the blunt apex of the carina 

 (figure), a fascicle of spines on either side, encreasing in importance on successive 



