310 6. 0. SARS, Is are 
2. Pseudocuma Sowinskyi, G. O. Sars, n. sp. 
(Pl. III). 
Specific Characteristics Q. — Very like the preceding species in its outward 
appearance, though perhaps a little more slender. Carapace with the bran- 
chial regions much swollen and evenly rounded above, with a low coarsely 
serrated crest running along their most prominent part, and continued ante- 
riorly on each side of the gastric region as far as the tip of the pseudo-rostra] 
projection; the latter very short and subtruncated at the tip; antero-lateral 
corners very much projecting, and having their anterior edge coarsely ser- 
rated. All the free segments of mesosome distinctly keeled dorsally, the keel 
being elevated in the 3 anterior segments to comparatively small rounded 
projections, in the 2 posterior segments to somewhat larger laminar pro- 
minences, that of last segment the most projecting and triangular in form; 
edge of the projections coarsely serrated. Segments of metasome without 
any keels dorsally. Ocular lobe rounded triangular, with the visual elements 
less distinct, the median cornea being inconspicuous. Antenne, oral parts, 
and legs nearly as in the preceding species. Uropoda, on the other hand, 
comparatively much shorter, not nearly attaining half the length of the 
metasome, scape scarcely longer than the rami; the latter equal-sized, and 
without any spinules on the inner edge. Telson transversely quadrangular. 
Length of adult female reaching 11 mm. 
Remarks. — Though very nearly related to the preceding species, this 
form may, on a closer examination, be readily distinguished by several well- 
marked characteristics. For instance the carapace differs in the distinct 
serrated crests running along the branchial regions and continued along the 
sides of its anterior part, in the considerably inferior size of the pseudo-rostral 
projection, and in the greatly-projecting antero-lateral corners, the anterior 
edge of which is coarsely serrated. Moreover the dorsal projections of the 
mesosome are far less prominent, and the 2 juxtaposed dorsal prominences 
oceurrring in P. pectinata are replaced by a single median projection of in- 
ferior size. Finally the metasome is more elongated, and the uropoda consi- 
derably shorter than in that Species. Only female specimens have hitherto 
come under my inspection. 
Description of the female, - 
The length of adult ovigerous specimens amounts to 11 mm., and this 
form thus attains a still larger size than the preceding species, and is in 
fact the largest of the hitherto known Caspian Cumacea. 
The general form of the body (see figs. 1 and 2) resembles that of 
P. pectinata, though being perhaps somewhat more slender, and thus cor- 
Mélanges biologiques, T. XIII, p. 474, 
