326 6. 0. SARS, [N. S. 1v 
western part of the North Caspian Sea, off the Tschistyi-Bank. Solitary spe- 
cimens were moreover captured at Stat. 48, almost in the same tract, and at 
Stat. 53, north of the islands of Kulaly and Morskoj. 
8. Pseudocuma bilamellata, G. O. Sars, n. Sp. 
(Pl. X and XI). 
Specific Characteristics. — Body comparatively slender and elongated, 
especially in the male, with the anterior division considerably shorter than 
the posterior and oblong oval in form. Carapace of moderate size, with the 
branchial regions sharply defined from each other by a low crest running 
along their most prominent part, and suddenly bent downwards in front; 
gastric area provided with 2 parallel, longitudinal keels, and terminating with 
a rather broad and transversely-truncated ocular lobe; pseudo-rostral projec- 
tion of a rather unusual shape, being divided by a deep incision into 2 juxta- 
posed, thin, oval lamellæ pointing somewhat obliquely upwards; antero-lateral 
corners in female nearly rectangular, in male more obtuse. Free segments of 
mesosome without any keel or projections above, but rather sharply defined, 
and having the epimera very broad; the 3 anterior ones rather short in their 
dorsal part, the 2 posterior comparatively large and massive. Metasome con- 
siderably more elongated in male than in female. Eye in male well developed, 
in female with only 2 corneæ placed wide apart. Superior antennæ rather 
elongated, with the last joint of the peduncle the longest. Inferior antennæ 
in male not attaining the length of the body. First pair of legs comparatively 
slender, and in male having the basal joint much curved; 2nd pair rather 
different in the two sexes, being much larger in the male, and having the 
terminal joint armed with recurved hooks. The 3 posterior pairs of legs 
rather strongly built, and of a structure similar to that in P. tenuicauda. 
Uropoda comparatively strong, with the scape densely setiferous inside, and 
the rami equal-sized, the inner one coarsely spinulose inside, apiéal spines 
in both comparatively short. Telson nearly quadrate in form. Length of adult 
female 9 mm, that of male 10 mm. 
Remarks. — This is a very distinct species, easily recognizable from any 
of those previously described, and especially clearly distinguished by the 
peculiar shape of the pseudo-rostral projection, which is, at is were, double, 
being divided by a deep incision into 2 juxtaposed, thin lamellze: hence the 
Specific name. 
Description of the female. 
(Pl. X). 
The length of adult ovigerous specimens measures about 9 mm., and this 
form thus belongs to the larger species of the genus. 
Mélanges biologiques, T. XIII, p. 490. 
