CRUSTACEA CASPIA. 291 



The 2 anterior pairs of uropoda (figs. 20, 21) arc comparatively strongly 

 built, with the rami subequal and armed at the tip with blunt spines. In the 

 1st pair (fig. 20) each of tlie rami lias besides a lateral spine, whereas in the 

 2nd pair (fig. 21) this is only the case with the inner ramus. 



The last pair of uropoda (fig. 22) are extremely small, reaching but little 

 beyond the others. The outer ramus is scarcely longer than the basal part, 

 and has one lateral and 2 apical spines, but no lateral seta). The terminal 

 joint of this ramus is so very minute as easily to escape attention, forming 

 only a diminutive nodule tipped with a few hair-like bristles. The inner 

 ramus is of the usual scale-like character and provided with a single apical 

 bristle. 



The telson (fig. 23) is likewise unusually small, scarcely reaching beyond 

 the basal part of the last pair of uropoda. It is divided by a deep and nar- 

 row cleft into 2 halves, each of which carries on the somewhat truncated tip 

 a single spine accompanied by a small hair. 



The adult male (fig. 24) is somewhat larger than the female, attaining 

 a length of about 13 mm., and has the metasome somewhat more fully de- 

 veloped, but is otherwise of a very similar appearance. In the structure of 

 the antenna', no other difference is to be found than that the flagella have a 

 somewhat greater number of articulations. Also the gnathopoda exhibit a 

 structure very similar to that in the female, though the posterior ones ap- 

 pear somewhat larger. 



Occurrence. — Of this interesting form a few specimens were collected 

 by Mr. Warpachowsky at Stat. 63, in the eastern part of the North 

 Caspian Sea. 



The collection of Dr. Grimm contains solitary specimens, derived from 

 4 different Stations, one of which is located in the southern part, the other 

 3 in the middle part of the Caspian Sea, the depth ranging from 7 to 48 

 fathoms. 



Fam. COROPHIIDyE. 



Gen. Coropllilim, Latr. 



Remarks. — This genus, as is well known, has hitherto been regarded 

 as exclusively marine, no species having ever been found in fresh water; 

 and even in brackish water it is rather seldom to meet with these peculiar 

 Amphipods, which on the whole would seem to be restricted to the open 

 Ocean coasts, where the water is very salt. From the Black Sea only 3 

 species are recorded by Mr. Sowinsky, and one of these, described as 



*ll;j.-Mill. mp. 109. 17 



