278 G. 0. SARS, 



tlie setfo, at the end of the joiuts slender spines. The antei)enultimate pair 

 (fig. 7) are, as usual, considerably shorter than the other 2, which are about 

 of equal length. The basal joint of the former is rather broad and obliquely 

 oval in shape, with the anterior edge considerably curved. The basal joint 

 of the penultimate pair (fig. 8) is considerably narrower and more elongated, 

 with the posterior edge slightly sinuate in the middle and fringed with 

 slender setio. The last pair (fig. 9) are distinguished by the large size of the 

 basal joint, which is greatly expanded and of a broad cordiform shape, with 

 the posterior edge strongly curved below the middle, and fringed with long 

 setse springing off from small serrations of the edge. The outer joiuts of 

 these legs nearly agree in their longitudinal relation with those in N. caspius. 



The 2 anterior pairs of uropoda (fig. 11) are rather stout, but otherwise 

 of quite normal structure, with the rami subequal and armed with scattered 

 spines of the usual kind. 



The last pair of uropoda (fig. 12) are comparatively short, and resemble 

 in structure those in the type species. The basal part is short and thick, 

 and is armed at the end below with a transverse row of 7 slender spines. 

 The outer ramus is about twice as long as the basal part, and densely fringed 

 in its outer part with ciliated seta?, having besides on the outer edge 2 strong 

 spines. The terminal joint of this ramus is extremely small, nodiform. The 

 inner ramus exhibits the usual scale-like shape, and scarcely exceeds in 

 length the basal part. It is armed at the tip with 2 strong spines, and lias 

 inside 3 small bristles. 



The telson (fig. 13) is, as in the other species, cleft to the base, being 

 accordingly divided into 2 halves, which are somewhat longer and less 

 diverging than in N. caspius. Each lobe carries at the obtusely truncated 

 tip a transverse row of 5 slender spines increasing in length outwards, but 

 is otherwise quite unarmed. 



Occurrence. — Of this species 2 specimens were collected by Mr. War- 

 pachowsky, the one at Stat. 2, in the western part of the North Caspian 

 Sea, south of the Tschistyi Bank, the other at Stat. 59, farther north, at 

 some distance from the mouth of the Wolga. Both specimens were of the 

 male sex. A third male specimen has been collected, according to the label, 

 by Dr. Baer, but without statement of locality. 



19. Niphargoides compactus, G. 0. Sars, u. sp. 



(PI. XVII, figs. 14—19). 



Specific Characters. — S- Body extremely robust and compact, having the 

 last 2 segments of mesosome and those of metasome each provided with a well- 



$n3.-iIaT. CTp. ISG. 4 



