362 G. 0. SARS, 



other (St. 12), in the inner part of the Bai Agrachansky, a 3rd (St. 40), off 

 the promontory Brjanskaja, a 4th (St. 31), about midway between the pen- 

 insula Mangyschlak and the opposite western coast, a 5th (St. 61), far 

 north, at some distance outside the Bai Bogatyi Kultuk, the remaining 

 Stations (16, 17, 23, 24, 26, 27, 28, 51, 54), distributed over the tract 

 uortli of the peninsula Mangyschlak. I have also had an opportunity of 

 examining some specimens of this species preserved in the Museum of St. 

 Petersburgh from earlier time, and collected by Baer and Gobel, partly at 

 Baku, partly at Krasnowodsk. 



Dr. Grimm has collected this species in several localities both of the 

 southern and middle part of the Caspian Sea, from the shore down to a 

 depth of 6 fathoms. A single specimen, that labelled G. robustoides, was 

 found at the considerable depth of 108 fathoms. 



Distribution. — To judge from the one of the specific names (aralo- 

 caspius) attributed by Dr. Grimm to this species, it would also seem to 

 occur in the Aral Sea. I have not yet, however, had an opportunity of exa- 

 mining any specimens from that basin. 



14. Gammarus crassus, Grimm MS. 

 (PI. xiir). 



Specific Characters. — Body rather short and stout, with broadly 

 rounded back. Lateral lobes of cephalon somewhat projecting and obtusely 

 rounded at the tip. Anterior pairs of coxal plates of moderate size, and 

 fringed distally with scattered bristles; 1st pair but very slightly widening 

 distally; 4th pair considerably expanded in their outer i)art, though of 

 scarcely as broad as they are deep. The last 2 pairs of epimeral plates of 

 metasome acutely jtroduced at the lateral coi'ners. Urosome smooth above, 

 1st segment with a dorsal fascicle of fine hairs, the 2 succeeding ones each 

 with one or two spinules on either side of the dorsal face. Eyes of moderate 

 size and oval reniform. Antennae nearly equal-sized, and scarcely attaining 

 to '/g of the length of the body; the superior ones with the 1st joint of the 

 peduncle about the length of the other 2 combined, flagellum considerably 

 longer than the peduncle, accessory appendage 4 — 5-articulate. Gnathopoda 

 in female not very strong, in male much more powerfully developed, the 

 posterior ones having the propodos very large. Anterior pairs of pereiopoda 

 less robust than in G. robustoides; the 3 posterior pairs moderately elon- 

 gated, with the basal joint rather expanded, that of last pair being very 

 large, with the posterior edge distinctly serrate, and having the infero- 

 posteal corner expanded to a broad, obtusely truncated lobe projecting far 



$H3.-MaT. cxp. 342. 20 



