CRUSTACEA CASPIA. 217 



De$cri|i(ion of the female. 



The largest f^ale specimens in the collection of Mr. Warpachowsky 

 reach a length of 15 mm., but there are also fully adult ovigerous specimens 

 of much inferior size. 



In its general appearance (see fig. 1) the animal looks very like the 

 well known typical species, G. marinus, locusta and pulex. As in the 

 latter, the body appears rather slender and compressed, with the mesosome 

 and metasome quite smooth throughout and the back evenly rounded, with- 

 out any trace of keel or projections. The urosome (see also fig. 3) is of 

 moderate size, and has the 2 anterior segments each elevated dorsally to a 

 small conical tubercle carrying at the tip 2 minute, juxtaposed spinules ac- 

 companied by a pair of fine hairs. Besides the 1st segment has on each side 

 of the dorsal face a single spinule, and 2 such spinules occur on the same 

 place in the last segment. 



The cephalon (fig. 2) about equals in length the first 2 segments of 

 mesosome combined, and appears almost transversely truncated at the tip, 

 the rostral projection being extremely small. The lateral lobes are rather 

 broad and somewhat obliquely truncated, with the inferior corner the more 

 prominent. They are defined form the postantennal corners by a very deep, 

 nearly angular emargination encircling the greatly swollen basal joint of 

 the inferior antennae. 



The 4 anterior pairs of coxal plates are of moderate size, being somewhat 

 deeper than the corresponding segments, and successively increase in size 

 posteriorly. The 3 anterior pairs are nearly quadrangular in shape, whereas 

 the 4th pair exhibit a rather irregular form, having their outer part 

 considerably expanded and angularly produced below the posterior emar- 

 gination. 



The 3 posterior pairs of coxal plates are comparatively small and of 

 the usual shape. 



The epimeral plates of the metasome are well developed, the 2 posteiior 

 paii-s being, as usual, larger than the anterior pair and both but very 

 slightly produced at the lateral corners. 



The eyes (see fig. 2) are of moderate size and of a pronouncedly reni- 

 form shape, with well developed visual elements and dark pigment. 



The superior antenna? (see fig. 1) nearly attain half the length of the 

 body, and are rather slender and but very sparingly setiferous. The joints 

 of the peduncle successively diminish in size, the 1st being much the largest 

 and equalling in length the other 2 combined. The flagellum is nearly twice 

 as long as the peduncle, and composed of numerous short articulations. The 



4B3.-MaT. CTp. 217. 39 



