CRUSTACEA CASPIA. 375 



The 2-nd pair of maxillfe (fig. 9) have the inner lobe smaller than the 

 outer, both being provided at the tip with numerous curved bristles, and the 

 inner lobe, in addition, with a series of seta somewhat inside the edge. 



The maxillipeds (fig. 10) are of moderate size, with the masticatory 

 lobes a little larger than the basal ones, and armed on the inner edge with 

 a row of strong spines, at the tip with several carved setae. The palp is 

 not very strong, with the last joint rather narrow, and the dactylus ungui- 

 form. 



The gnathopoda (figs. 11, 12) are powerfully developed and very un- 

 equal in size, the posterior ones being much the larger. In structure they 

 otherwise nearly agree with each other, both pairs having the basal joint 

 rather strong and muscular and the carpus comparatively small, with a nar- 

 row setiferous lobe below. The propodos, especially in the posterior pair 

 (fig. 12), is very large and elongated, gradually tapering distally, with the 

 palm very oblique and scarcely defined from the hind margin by any distinct 

 angle, though marked off from by 2 strong spines. 



The 2 anterior pairs of pereiopoda (figs. 13, 14) are very strongly built 

 and densely setiferous. The meral joint is considerably expanded, termina- 

 ting in front in a projecting, densely setous corner, and also the carpal joint 

 somewhat widens distally, whereas the propodal joint exhibits the usual 

 narrow linear form. 



The 3 posterior pairs of pereiopoda (figs. 15 — 17) are likewise rather 

 strong and moderately elongated, being, like the anterior ones, densely 

 covered with bristles both on the basal and terminal part. There also occur 

 on the outer joints a number of strong spine;?, especially densely crowded at 

 the end of the meral and carpal joints. The antepenultimate pair (fig. 15) 

 are, as usual, somewhat shorter than the succeeding pairs, and have the basal 

 joint not very large, oblong oval in form, and not at all produced at the 

 infero-posteal corner. The basal joint of the penultimate pair (fig. 16) is 

 somewhat more elongated, but otherwise of a similar appearance to that of 

 the former pair. The last pair (fig. 1 7) have the basal joint much larger 

 than in the preceding ones, and of a rather regular oval form, with the distal 

 part of the anterior edge very densely clothed with bristles and projecting 

 below as an obtuse corner. The posterior edge of the joint is (juite evenly 

 curved, and, as in the preceding pairs, densely fringed with rather long and 

 slender bristles. Of the outer joints of these legs, the carpal one is fully as 

 long as the propodal one, the dactylus not being very strong. 



The 2 anterior pairs of uropoda (figs. 18, 19) are comparatively strongly 

 built, with the rami subequal and rather stout, each having at the tip 4 un- 

 usually coarse and somewhat blunted spines, and a single lateral one. 



"I'us.-MaT. cTp. 355. 33 



