CRUSTACEA CASPU. 299 



distinctly pigmented; and especially the inferior antenusD in the male show 

 a rather peculiar arrangement of the pigment, as sliowu in fig. 2 on PI. XX 

 and fig. 1 on PI. XXI. 



Occurrence. — This ])retty species has been collected by Mr. Warpa- 

 chowsky in 9 different Stations of the Nortli Caspian Sea, tliough in none 

 of them occui-riug in any considerable luimber. Of the Stations 6 (St. 17, 23, 

 24, 26, 52, 53) are distributed in the tract north of the peninsula Maugy- 

 schlak, the other 3 (St. 61, 63, 64) in the northern and eastern part of the 

 basin. 



In the collection of Dr. Grimm this species is also represented, having 

 been collected in several places botli of the southern and middle part of the 

 Caspian Sea, at a depth ranging from 6 to 40 fathoms. 



24. Corophium chelicorne, G. 0. Sars, n. sp. 



(PI. XXII). 



Specific Characters. — Frontal edge of cephalon not pi-oduced in tiie 

 middle, lateral lobes narrowly rounded. First pair of coxal plates with only 

 3 slender bristles at the tip. The last 2 segments of urosome less distinctly 

 defined. Superior antennae but sparingly setous, and in female scarcely ex- 

 ceeding ^3 of the length of tlie body, 1st joint of the peduncle about the 

 length of the other 2 combined, and in female armed below with about 7 

 spinules, in male without any such spinules, 2nd joint in male considerably 

 longer than in female, flagellum in both sexes shorter than the peduncle. 

 Inferior antennas very strongly built, especially in the male, penultimate 

 joint of the peduncle exceedingly large and produced at the end posteriorly 

 to a very prominent, acuminate, thumb-like projection having inside a 

 small secondary tooth; last peduncular joint scarcely more than half as long 

 as the preceding one, and armed below the middle with a short recurved 

 projection, being moreover produced at the end to a strong spiniform pro- 

 cess, which crosses the end of the thumb-like projection when the joint is 

 incurved, thereby giving these autenuai a pronounced cheliform character; 

 flagellum about the length of the last peduncular joint, and of the usual 

 structure. Gnathopoda scarcely differing in their structure from those in the 

 preceding species. Anterior pairs of pereiopoda somewhat stronger, but 

 rather much elongated, with the meral joint longer than the last 2 com- 

 bined, and gradually widening distally, anterior edge scarcely setous. Last 

 pair of pereiopoda somewJiat shorter and less slender than in the preceding 

 species, otherwise of a very similar appearance. The 2 anterior pairs of 

 uropoda with the rami spinous only at the tip and the outer edge. Last pair 



4ii3.-MaT. cip. 207. 25 



