CRUSTACEA CASPIA. 373 



Telson with the lateral lobes sublineax' and slightly diverging, each carrying 

 at the tip 3 strong spines. Length of adult male 1 1 mm. 



lieinarks. --* In the collection of Dr. Grimm, 2 nearly allied, but evi- 

 dently distinct species are labelled as Niphargus caspius. For the larger 

 species this specific name may be retained; for the other species, which is 

 not contained in the collection of Mr. Warpachowsky, I propose the name 

 of Niphargoides Grimmi. The species here described is easily distinguished 

 by the densely hirsute anterior pairs of coxal plates and legs, the peculiar 

 conically tapering shape of the propodos of both pairs of guathopoda, as 

 also by the form of the basal joint of the last pair of pereiopoda. Most of 

 the specimens examined would seem to be of the male sex. 



Description of the adult male. — The length of the largest specimen 

 measures about 12 mm. 



The form of the body (see fig. 1) is somewhat elongated, but rather 

 robust, and not at all compressed, the breadth being fully as great as the 

 height, including the coxal plates. The dorsal face is broadly vaulted and 

 quite smooth throughout. In a dorsal view (fig. 2) the body exhibits a some- 

 what fusiform shape, with the greatest breadth occuring across the 4th seg- 

 ment of the mesosome, whence it gradually tapers both anteriorly and post- 

 eriorly. The metasome is well developed and about half the length of the 

 anterior division of the body. 



The cephalon is comparatively small, but little longer than the 1st seg- 

 ment of the mesosome, and does not exhibit any distinct rostral projection. 

 The lateral lobes somewhat project between the insertions of the 2 pairs of 

 antennae, and are obtusely rounded at the tip. Behind they are defined by a 

 very deep emarginatiou, encircling the large and globular basal joint of the 

 inferior antennas. 



The anterior pairs of coxal plates are not very large, being but little 

 deeper than the corresponding segments, and are somewhat discontiguous 

 in their outer part. They successively increase in size posteiioily, and have 

 their distal edge very densely clothed with slender bristles in an almost 

 brush-like manner. The 1st pair (see fig. 11) are about same breadth 

 throughout, and obtusely rounded at the tip ; the 2 succeeding pairs (see 

 fig. 12) are a little narrowed distally, whereas the 4th pair (see fig. 14), 

 as usual, are somewhat expanded in their outer part, forming, below the 

 rather slight posterior emargination, an obtuse corner. 



The 3 posterior pairs of coxal plates (see figs. 15 — 1 7j are unusually 

 small and slightly bilobed. 



The epimeral plates of the metasome are rather large, the 1st pair being, 

 as usual, rounded, whereas the last 2 pairs are nearly rectangular, and 



$H3.-MaT. CTp. 353, 31 



