CRUSTACEA CASPU. 281 



pair, armed with a strong spine, which is accompanied hy 2 smaller ones. 

 The carpus is shcrt and broad, being produced below to a narrow seti- 

 ferous lobe. 



The pereiopoda (see fig. 14) are on the whole very similar to those in 

 N. corpiilentus, and, as in that species, the basal joint of the last pair is 

 very large and laminar, being densely fringed with bristles. 



The 2 anterior pairs of uropoda are of the usual structure. 



The last pair of uropoda (see fig. 19) appear somewhat more fully de- 

 veloped than in the 2 preceding species, and have the outer ramus rather 

 broad, sublamellar, and densely fringed with ciliated setJB. As in the pre- 

 ceding species, there are besides on the outer edge of this ramus 2 ledges, 

 to each of which are secured 2 spines. The terminal joint is so very small 

 as easily to escape attention. The inner ramus exhibits the usual scale-like 

 appearance and has inside a row of 7 short, ciliated set;Te, at the tip 2 small 

 spines. 



The telson (ibid.) resembles that in N. corjmlentus, except that each of 

 the lateral halves has only 4 apical spines. 



Occurrence. — The above described specimen was taken by Mr. War- 

 pachowsky last summer in the eastern part of the North Caspian Sea, at 

 Stat. 65. 



20. Niphargoides quadrimanus, G. 0. Sars, n. sp. 



(PI. XV, figs. 1 — 13). 



Specific Characters. — Body less robust than in the 3 preceding species, 

 and not nearly so tumid, back quite smooth throughout. Cephalon rather 

 small, with the lateral lobes broadly rounded. Anterior pairs of coxal plates 

 of moderate size, and fringed distally with a regular row of bristles; 1st pair 

 scarcely expanded distally; 4th pair about as broad as they are deep. Last 

 pair of epimeral plates of metasome nearly rectangular, and without any row 

 of bristles outside the lateral corners. Eyes comparatively small, oval reni- 

 form. Antennte comparatively more elongated than in the 3 preceding species 

 and subequal in length, the superior ones with the 1st joint of the peduncle 

 very large, fully twice as long as the other 2 combined, flagellum exceeding 

 half the length of the peduncle, accessory appendage 6-articulate. Inferior 

 antenna3 rather strongly built, with the antepenultimate and penultimate 

 joints of the peduncle expanded posteriorly to setiferous lobes, the outer 2 

 peduncular joints being moreover armed with spines arranged in oblique 

 rows, flagellum exceeding half the length of the peduncle. Gnathopoda of 

 exactly same appearance in the 2 sexes, being rather powerful and some- 



4'a3.-MaT. CTp. 1S9. 7 



