68 G. 0. SARS, [N. s. Iv 
poda (fig. 13) of uniform structure and comparatively slender, with the 
ischial and meral joints but little expanded, tarsal part divided into 3 arti- 
culations, the 1st of which is much the largest, dactylar joint (see fig. 14) 
having the terminal claw rather strong and not defined from the joint. Outer 
sexual appendages of male (fig. 22) comparatively small. Third pair of ple- 
opoda in male (fig. 23) simple, not biramous, but having the proximal part 
considerably tumefied; 4th pair (fig. 24) distinctly biramous, inner ramus 
of the usual structure, outer one not much prolonged, and forming a some- 
what irregular stem, not being divided into any articulations, and terminat- 
ing in a single spiniform flagellum, smooth at the edges. Telson (fig. 16) 
not very large, with the outer part considerably attenuated, lateral edges 
 Spinulose, tip insinuated in the middle, the sinus (fig. 17) being bordered 
with a number of small dentiform projections, terminal lobes each armed 
with a strong apical spine. Uropoda (fig. 15) with the inner lamella much 
shorter than the outer and considerably tumefied at the base. 
Remarks. — The present genus, established by Mr. Czerniavsky, is 
nearly allied to the genus Diamysis of the same author, the type of which 
is Mysis bahirensis G. O. Sars. It distinguishes itself, however, by the 
more slender form of the body, the much fuller development of the apical 
segment of the antennal scales and the peculiar modification of this segment 
in the male, moreover by a somewhat different form and armature of the 
terminal joint of the palp in the 2nd pair of maxille, as also by the uniform 
structure of the pereiopoda and the structure of their dactylar joint, and 
finally, by the somewhat different structure of the 4th pair of pleopoda in 
the male. The 3 genera Potamomysis, Euxinomysis and Onychomysis of the 
same author, would likewise seem to come rather near to the present one, 
though being apparently distinct. Mr. Czerniavsky refers to this genus 
3 species, viz., L. Brandtii, L. Benedeni, and L. Schmankewiczi, the last 2 
of which, however, are only founded upon the 2 sexes of one and the same 
species, that described below, whereas the first named would seem to be 
distinct. The genus has not yet been known from the Caspian Sea. 
8. Limnomysis Benedeni, Czern. 
(Pl. VIN). i 
Limnomysis Benedeni, Czerniavsky, l. c. fasc. 1, p. 124, Pl. X, figs. 13—24, Pl. XI. 
Syn.: Limnomysis Schmankewiezi, Czern. (male). 
»  Mysis relicta, var. pontica, Grebnitzki (according to Czern.) 
Specific Characters. — Body (see Pl. VIII, figs 1 & 18) slender and 
elegant in form, with the anterior division but little tumefied, and the poste- 
rior one evenly attenuated. Carapace deeply emarginated posteriorly, leav- 
Mélanges biologiques. T. XIII, p. 416. 
ος ο RESTE NENNEN. RP 3 
ο ci σος n A AQ MEE een usi ES 
