CRUSTACEA CASPIA. 459 



and curved anteriorly towards the point of the lateral lobes. The visual 

 elements are well developed, and the pigment very dark. 



The superior antennaj are very slender and elongated, almost attaining 

 ^|^ of the length of the body. They are clotlied posteriorly with numerous 

 fascicles of slender bristles, and have the 2nd joint of the peduncle fully as 

 long as the 1st. The flagellum is about twice as long as the peduncle, and 

 is composed of numerous short articulations. The accessory appendxige is 

 rather fully developed, considerably exceeding in length the last peduncular 

 joint, and is composed of 7 articulations. 



The inferior antennae are shorter than the superior, and still more 

 densely clothed with seta;, arranged in regular fascicles along the posterior 

 edge of botli the peduncle and the flagellum. The latter nearly equals the 

 peduncle in length, and is composed of about 1 6 articulations. 



The guathopoda of the female (figs. 4, 5) are not very powerful, and are 

 nearly equal-sized, the posterior ones being only a little more elongated than 

 the anterior. Both pairs are densely clothed with slender, fasciculated bristles, 

 and hav(! the propodos slightly different in shape, that of the posterior ones 

 (fig. 5) being somewhat longer and more transversely truncated at the tip. 

 In the male the posterior gnathopoda are considerably larger than the ante- 

 rior, but as none of the male specimens examined were fully grown, no 

 figures are given here. 



The 2 anterior pairs of pereiopoda (see fig. 1) are rather slender and 

 somewhat unequal in length, the 1st pair being the longer, but otherwise 

 exactly agreeing with the 2nd pair. 



The 3 posterior pairs of pereiopoda are more strongly built, and rather 

 elongated, being generally strongly reflexed. The basal joint in all of them 

 (see figs. 7- — 9) is rather narrow, and in the last pair (fig. 9) not at all 

 differing from that of the penultimate pair, either in size or shape. The 

 outer part of all these legs is edged with scattered fascicles of short spines. 



The 2 anterior pairs of uropoda (fig. 10) have both the basal part and 

 the rami rather densely spinous, but are otherwise quite normal in structure. 



The last pair of uropoda (fig. 11), on the other hand, are very remark- 

 able from their extraordinary length, being even more than twice as long 

 as the urosome. The outer ramus is of uniform breadth throughout, linear 

 in form, and provided on both edges with numerous fascicles of short spines 

 accompanied by a few small bristles. The terminal joint is spiniform and 

 almost hidden between the spines issuing from the end of the proximal joint. 

 The inner ramus is so extremely small as easily to be overlooked. 



The telson (fig. 1 2) is rather short, being almost twice as broad as it is 

 long, and has the cleft rather narrow. The lateral lobes have the outer edge 



•faa.-MiiT. CTp. 2S8, 39 



