(XXXVI)] CRUSTACEA CASPIA. 63 
eee relie, Czern.- 
UT (PI. WIR [HTS 
Mesomysis intermedia. erg ο, fase. 2, p.152, PI. XXII, figs. 14-20, Pl. XXIIT} 
(Specific Gates — Rens of SE Gre Pk VI, fig. “ gege as in 
M. Czerniavskyi. Carapace having the cephalic: part about as broad as the 
Ist segment of metasome, anterior edge evenly arched in the middle, frontal 
spine uncovered (see fig. 2). Eyes (ibid.) of the usual pyriform shape) and 
projecting laterally somewhat beyond thé sides of the carapace, corneal: part, 
as seen from above, réniform in shape. Antennal scales (see fig. 3) exceed- 
ing the peduncles of the superior. antennze by considerably more than. ¥/, 
of their length, and oblong rhomboidal in form, the apex being rather  obli- 
quely truncated, with the terminal part in-front of thelouter corner. (see fig. 
4) occupying’ more ‘than !/, of the length of the scale; apical, segment:well 
defined. Pereiopoda (fig. 6) rather slender, with the ischial and meral joints 
comparatively less dilated than. in the other Species, tarsal part scarcely 
longer than the meral joint, dactylar joint (fig. 7) of the usual structure. 
Pleopoda (fig. 12, 13) scarcely differing from those in the other species, 
except that the outer ramus of the 3rd pair in male (fig: 12) appears somewhat 
smaller, scarcely exceeding half the length of the inner: Telson (fig. 8) about 
the length of the last Segment of metasome, and rather attenuated distally, 
lateral edges nearly straight, and armed each with from 16 to 19 spinules; 
the outmost! of ‘which is hót far remote from ed EA Spital sinus (see fig. 9) 
quite obsolete, the terminal édge being trans ly truneated’and bordered 
With a regular series of 14’ acute dentiform projections, spines of the outer 
corners not very strong. Inner lamella of the uropoda (fig/:10) considerably 
ο at the base, with the otolith very large, inner edge armed, below 
the marginal setze, with 4 spines only, the-outmost of which is tather remote 
from the apex. Body without any distinct dendritic ramifications, though 
having the usual dorsal qoin dumis ‘Length of adult So N 
exceeding 19πππι... I7 
Remarks. The Se species has ie iet Eesen desto 
and figured. by Mr. Czerniavsky; and as I moreover lave not had an BBs 
portunity of examining his type specimens, [should have been in eonside 
doubt about the identity: of the species here described, if there were. nota 
single very prominent feature, in which both forms would seem perfectly to 
agree, viz.; the peculiar want: of any true apical:sinus on the telson, its apex 
being transversely truncated, though exhibiting the usual comblike AERA 
ture of thé edge. Besides this characteristic, the present species is easily 
distinguishable from the 3. preceding ones by the much more μμ, trun- 
Melanges biologiques. T. XII, p. 411. 
