142 
head protrudes somewhat like a small triangle, besides, we see a knot-like protuberance, 
somewhat in front of the middle, at a short distance from the outline of the back. The 
head is exceedingly small in proportion to the trunk, and it is distinguished by the particular 
solidity of the chitinised parts to the front and on the sides, which, moreover, laterally and 
anteriorly extends considerably on the lower surface, so as to render the area with the 
appendages somewhat smaller than in the other species. The frontal margin naked (fig. 5c). 
Antennule slender, of medium length, second jot proportionally longer than in the preceding 
species, the seta of about medium length. Antenne 3-jointed, basal joint short, second 
joint longer than the third, and the latter longer than the seta. Mouth large, with border 
of medium breadth. Additional branch of the maxillule well developed. Mavxille rather 
small, their basal jomt smooth. Maxillipeds comparatively short and slender, yet somewhat 
longer than in S. Dalichie@; the basal jomt has one or two stripes of excessively short hairs 
(not shown in the drawing) on the inner side, and similar hairs on the inner part of the 
terminal margin; second and third joints separated, the last joint pointed. Sub-median 
skeleton provided with thick lists, naked; a double list between the head and the trunk, 
somewhat behind the base of the maxillipeds. Lateral margin of the head naked. Trunk 
naked; the trunk-legs are small but conspicuous, rounded knots without setae — thus deviating 
much from all other species. Genital area (fig. 5d) somewhat narrower than the head, much 
broader than long, firmly chitinised all over; it has a Jong, somewhat concave, anterior 
margin, convex, oblique lateral margins and a shorter, deeply incised, posterior margin. 
The genital apertures situated somewhat behind the middle of the plate; they are of medium 
size, close together anteriorly, and somewhat diverging posteriorly. The caudal stylets in 
close proximity on the plate close to its posterior margin; they are small, each ending in a 
rather long seta. The whole genital area naked. (In the illustration the orifices of the 
receptacula ‘seminis are seen at a short distance in front of the genital apertures). 
MALE, OVISACS, LARVA and POST-LARVAL DEVELOPMENT. Unknown. 
HABITAT. In the marsupium of a female of Acanthozone cuspidata (Lepech.) 
from the Kara Sea was found a single female. 
25. Sphezronella frontalis n. sp. 
(Pl. VII, fig. Ga—6i; pl. VIII, fig. La—te). 
FEMALE. The largest specimen (fig. 1a) is 184mm. long and 1°71 mm. broad, 
and the thickness about three fifths of the breadth. The body is narrower towards the 
front, and its long posterior outline is sligthly concave in the middle. The head nearly 
middle-sized and distinctly defined from the trunk. An excellent character of this species 
is that the naked frontal margin expands in the middle into an oval, transverse, flat cup 
(fig. 1d), the breadth of which somewhat exceeds the diameter of the basal joint of the 
