CRUSTACEA CASPIA. 435 



Bemarhs. — This new genus is somewhat intermediate between the 

 genera (Imelina and AmathUlina, though apparently more nearly related to 

 the former. It contains as yet 2 species, to be described below. 



6. Gmelinopsis tuberculata, G. 0. Sars, n. sp. 



(PI. 3, figs. 1—19). 



Specific Characters. — Cephalon with the lateral prominence obtusely 

 rounded at the tip. Segments of mesosome with distinct lateral tubercles. 

 Last segment of mesosome, and those of metasome elevated dorsally to 

 rounded lamellar expansions. Urosome smooth above. Anterior pairs of 

 coxal plates fully twice as deep as the corresponding segments. Epiraeral 

 plates of metasome scarcely produced at the lateral corners. Eyes oblong 

 oval placed close to the anterior edges of the cephalon. Superior autenn* 

 nearly twice as long as the inferior, flagellum longer than the peduncle. 

 Anterior gnathopoda with the propodos rather large, oblong oval, palm ob- 

 lique and defined below by an obtuse corner carrying a strong spine. Post- 

 erior gnathopoda with the propodos much smaller and quadrangular in form. 

 Last pair of pereiopoda with the basal joint obliquely expanded, nearly 

 cordiform in shape. Telson cleft nearly to the base, the cleft gradually 

 widening posteriorly, lateral lobes tapering conically, and armed each with 

 a slender apical spine, accompanied by a small hair, and with a delicate 

 lateral bristle. Length of adult female 8 mm. 



BemarKs. — This form may be regarded as the type of the genus, and 

 is easily distinguished from the succeeding species by the different form of 

 the lateral prominences of the cephalon and of the dorsal expansions, as 

 also by the structure of the telson. 



Description. — The length of a fully adult female specimen measures 

 about 8 mm. 



The body is highly compressed and, seen laterally (fig. ]), rather stout, 

 with the back considerably curved, and distinctly carinated in its posterior 

 part. All the segments of the mesosome have their lateral parts distinctly 

 prominent, forming a series of well-defined lateral tubercles. Moreover, the 

 last segment of the mesosome, and those of the metasome are elevated to 

 laminar dorsal expansions, which, however, are not very prominent, and 

 are obtusely rounded. 



The cephalon (see fig. 2) is comparatively short, but little longer than 

 the 1st segment of the mesosome, and exhibits in front a distinct, though 

 not very prominent rostral projection. The lateral lobes are rather small 

 and nearly rectangular. Behind them issues, from each side of the head, a 



4na.-MaT. CTp. 265. 1 5 



