CRUSTACEA CASPIA. 369 



The cephalon about equals in length the first 2 segments of the meso- 

 some combined, and has the lateral lobes but slightly prominent and evenlj^ 

 rounded at the tijf 



The anterior pairs of coxal plates are unusually large and closely con- 

 tiguous, being nearly twice as deep as the corresponding segments. They 

 are fringed on the distal edge with rather long and slender sette springing 

 from small crenulations of the edge. The 1st pair (see fig. 4) are rather 

 broadly expanded in their outer jiart, nearly concealing the buccal area 

 at the sides. The 2 succeeding pairs (see fig. 5) are oblong quadrangular 

 in form and of nearly same breadth throughout. The 4th pair (see fig. 6) 

 are, as usual, larger than the preceding pairs, though not very much ex- 

 panded, in their outer part, being not nearly as broad as they are deep. 

 Their posterior expansion is obliquely truncated and projects immediately 

 below the emargination to an acute corner. 



The epimeral plates of the metasorae are not very large, and not at all 

 produced at the lateral cornei's, the 1st pair being evenly rounded, the 

 other two obtusangular. 



The urosome is comparatively short and stout, and quite smooth ahove, 

 with only a very small spinule on each side of the dorsal face of the last 

 segment. 



The superior antennae (fig. 2) about equal in length Yg of the body and 

 have, as in the preceding species, the 1st joint of the peduncle rather large, 

 exceeding in length the other 2 combined. The flagellum is somewhat longer 

 than the peduncle, and composed of about 15 articulations. The accessory 

 appendage is comparatively small and in the specimen examined consisted 

 of only 2 articulations. 



The inferior antennae (fig. 3) are a little shorter than the superior, and 

 have the flagellum about the length of the last 2 peduncular joints com- 

 bined, and composed of 7 articulations. 



The gnathopoda (figs. 4, 5) are of moderate size and almost exactly alike, 

 though the posterior ones (fig. 5) are perhaps a little larger than the ante- 

 rior (fig. 4). The carpus is in both pairs comparatively short and expanded 

 below to a rounded setiferous lobe. The propodos is oval quadrangular in 

 form, with the palm rather short, and defined below by an obtuse angle 

 carrying a single spine. 



The 2 anterior pairs of pereiopoda (fig. 6) are moderately strong and 

 densely setiferous, some of the setse attached to the posterior edge of the 

 meral joint being distinctly ciliated. 



The 3 posterior pairs of pereiopoda (figs. 7 — 9) are comparatively 

 strongly built and very densely setiferous, with the carpal joint compara- 



*Ha,-MaT. CTp. 349. 27 24 



