CRUSTACEA CASPIA. 479 



the posterior, the latter rather robust, with the outer part spinous, basal 

 Joint of last pifir obliquely expanded, that of the 2 preceding pairs regularly 

 oval. Propodal joint in all the legs exhibiting at the end a short but well 

 defined palm armed with several strong spines; dactylus strongly curved, 

 unguiform. Last pair of uropoda with the outer ramus nearly 3 times as 

 long as the basal part. Telson with the lateral lobis sub-linear, and each 

 armed with 3 apical spines. Length of adult female 9 mm. 



Remarks. — In my opinion, the above-characterized species is as yet 

 the only one referable to this genus, its specific name being probably de- 

 rived from the peculiar armature of the pi'opodal joint of the pereiopoda. 



"Bescription. — The length of fully adult specimens measures about 

 9 mm. 



The general form of the body (see fig. 1) appears rather robust and 

 somewhat compressed, the back being evenly vaulted and smooth thi'ougjiout. 



The cephalon is comparatively short, but little exceeding in length tlie 

 1st segment of the mesosome, and forms in front, between the bases of tlie 

 superior antenn?e, a very small rostral projection. The lateral lobes are very 

 obliquely truncated, so as to form in front an angular corner. 



The anterior pairs (if coxal plates are rather large, being considerably 

 d(!epcr than the corresponding segments, and are crowded together, so as to 

 form a nearly continuous wall. Tlie 1st pair are very slightly expanded 

 distally, and are somewhat angular in front, their distal edge being, as 

 in the other pairs, quite smooth. The 2 succeeding pairs are more regularly 

 oblong quadrangular in form. The 4th pair are, as usual, the largest, being 

 however much deeper than they are broad. They exhibit posteriorly in their 

 upper part a distinct emargiuation, and are produced below the emargina- 

 tion to a short transversely-truncated expansion. 



The 3 posterior pairs of coxal plates are somewhat more fully developed 

 than in most other Ganimarida;, the antepenultimate pair (see fig. 1 3) being 

 almost half as large as the preceding one, and having both lobes nearly 

 equal-sized. 



The epimeral plates of the metasomo arc of moderate size, the last pair 

 being acutely produced at the lateral corners. 



The urosome is comparatively short and stout, and slightly carinated 

 dorsally, each of the 2 anterior segments being distinctly elevated at the 

 hind edge. They, moreover, carry in the middle a few simple hairs, and on 

 each side a single, well-defined spinule. The last segment is provided on 

 each side with 2 such spinules. 



The eyes are of moderate size, and oval in form, with dark pigment. 



'J>U3. -M^T. cip. 309. 59 



