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 spiniforin flagellum, smooth at the edges. Telson (fig. 1 6) 

 not veiy 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. 1,5) 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 Biamysis of the same author, the type of which 

 is Mysis hahirensis G. 0. 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 maxillae, 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 Onycliomysis 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. 



(PI. VIII). 

 Limnomysis Benedeni, Czerniavsky, 1. c. fasc. 1, ]). 124, PI. X, figs. 13^24, PI. XI. 



Syn.: Limnomysis Schmankewiczi, Czern. (male). 



» Mysis relicta, var. pontica, Grebnitzki (according to Czern.) 



Specific Characters. — Body (see PI. 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 cmarginated posteriorly, leav- 



Me'langcs liiologiciuos. T. XIII, p. 410. 



