Niphargoides 451 



Side-plates 1 — 4 densely setiferous, 1®* not expanded distally. Pleon Segments 2 

 and 3, postero-lateral corners uearly qiiadrate, with a short oblique row of 

 setules on outer surface, descending to the äugle. Eyes not large, oval reniform, 

 dark. Antenna 1 about ^/, as long as body, 1^* Joint massive, much longer than 

 2^ and 3^ combined, 2^ about twice as long as 3*^, flagellum 7-jointed, 

 accessory flagellum 3-jointed. Antenna 2 slightly longer, antepenultimate 

 Joint of peduncle stout, with densely setose angular projection below, ultimate 

 Joint shorter than penultimate, flagellum 5-jointed. Gnathopods 1 and 2 

 similar, b^^ Joint short, cup-shaped, 6*^ elongate, gradually tapering to the 

 very oblique palm, which is much shorter than bind margin, and chiefly 

 defined by 2 skong spines; gnathopod 2 much the larger. Peraeopods 1 — 5 

 densely setiferous, 1^* and 2*^ with 4*^ Joint large, widening distally, 3^ and 

 4*'^ with 2^ Joint oblong oval, naiTOwing distally, peraeopod 5, 2^ Joint 

 much more expanded, broadly oval, bind margin evenly curved. Üropods 1 

 and 2, each ramus armed at apex with 4 blunt spines, and with 1 on the 

 lateral margin. üropod 3, peduncle with fringe of spines, outer ramus not 

 twice as long as peduncle, rather broad, distal half fringed with plumose 

 setae, 2 spines on outer margin, 2^ Joint minute; inner ramus shorter than 

 peduncle, tipped with 1 spine. Telson, lobes rather divergent, each with 3 

 spines on the obtysely ti'uucate apex. L. 11 mm. 



Caspian Sea. Depth 66 — 75 ni. 



2. N. corpulentus 0. Sars 1895 i\^. c, G. 0. Sars in: Bull. Ac. St.-Petersb., 

 ser. 5 v.'6 p. 275 t. 17 f. 1 — 19. 



o unknown. — ö. In general like N. caspius, differing as follows. 

 Body more robust and with pleon segments 4—6 slightly raised dorsally, 

 caiTying a few small hairs, and with 2 subdorsal spinules on pleon segments 5 

 and 6; side-plates 1 — 4 larger and less densely setiferous; pleon segment 2 

 without the oblique row of setules. Antenna 1, flagellum 8-jointed, accessory 

 flagellum 4-jointed; antenna 2 scarcely longer, flagellum 6-jointed. Gnathopods 1 

 and 2 less powerful, 6**^ Joint not tapering, but oblong quadrangular, with palm 

 less oblique and defined by a distinct angle, carrying 2 or 3 unequal spines. 

 Peraeopods 1 and 2, 5*^ Joint rather wider; peraeopod 3, 2^ Joint more 

 regularly oval; peraeopod 4, 2*^ Joint narrow, elongate, with the bind margin 

 slightly sinuous; peraeopod 5, 2<^ Joint gi'eatly expanded, broadly heai*t-shaped, 

 widest below, the long setae of the strongly curved bind margin springing 

 from small serrations. Uropods 1 and 2, rami less blunt, with the spines 

 more distributed; uropod 3, outer ramus about twice as long as peduncle, inner 

 tipped with 2 spines, and carrying 3 setules on inner margin. Telson with 

 lobes rather less divergent, each broad apex carrying 5 spines. L. 14 mm. 



Caspian Sea. — 



3. N. eompactus 0. Sars 1895 N. c, G. ü. Sars in: Bull. Ac. St.-Petersb., ser. 5 

 V.3 p. 278 1. 17 f. 14-19. 



5 unknown. — Ö . Agi-eeing nearly with N. corpulentus. Body extremely 

 robust and compact, peraeon segments 6 and 7 and pleon segments 1 — 3 

 each with transverse dorsal fun-ow, pleon segment 5 can-ying 2, segment 6 

 having 4 subdorsal spinules. Side-platel distally expanded. Antenna 1, 2^ Joint 

 more than thrice as long as 3*^, longer than the 9-jointed flagellum, accessory 

 flagellum 4-jointed. Antenna 2, ultimate and penultimate joints of peduncle 

 comparatively slender, flagellum very short, 6-jointed. Gnathopods 1 and 2 

 similar, powerful, with piriform band, thus differing in shape from those in other 



29* 



