T. Xin] CRUSTACEA CASPIA. 413 



with a strong spiniform projection; posterior lip (fig. 7) of the usual shape. 

 Mandibles (fig. 8 & 9) comparatively large, with the palp well-developed 

 and edged with ciliated setae. First pair of maxillae (fig. 10) having the 

 masticatory lobe very narrow and attenuated, exognath forming only a small 

 laminar expansion ciliated at the edge. Second pair of maxillae (fig. 11) 

 with the terminal joint of the palp oval in form, and having only a very 

 restricted number of setae on the outer edge, exognath not very large, and 

 triangular in form, with comparatively few marginal setae. Maxillipeds (fig. 



1 2) with the basal and masticatory lobes well-developed. Gnathopoda (fig. 



13) extremely robust, with the joints very much dilated, the meral and 

 tarsal ones being much the largest, terminal joint (fig. 14) scarcely lamellar, 

 and having at the tip several very strong and claw-like spines. Pereiopoda 

 short and stout, the 2 anterior pairs (fig. 15) with the tarsal part well 

 defined, and composed of 3 articulations; the 4 posterior pairs (fig. 17) having 

 the tarsal part quite rudimentary, and armed with strong, claw-like, incurved 

 spines, dactylar joint in the former (fig. 16) normal, in the latter (fig. 18) 

 nearly obsolete. Pleopoda of male (fig. 22, 23) modified in a similar manner 

 as in the 2 preceding genera. Telson (fig. 20) not very large, and triangu- 

 lar in form, tapering to an obtuse point bearing 2 strong spines, lateral 

 edges spinulose. Uropoda (fig. 19) with the inner lamella but little shorter 

 than the outer. 



Remarks. — The present new genus is chiefly distinguished by the very 

 remarkable reduction of the terminal part in the 4 posterior pairs of perei- 

 opoda, which thereby look as if they were mutilated. The structure of the 

 antennal scales somewhat resembles that in the genus Austromysis, but the 

 telson is constructed upon a totally different type, not being incised poste- 

 riorly, but terminating in an obtuse point. Also in the structure of the oral 

 parts and that of the gnathopoda, the genus exhibits several well-marked 

 differences from its nearest allies. The genus is as yet only represented by 

 a single species, to be described below. 



o 



7. Katamysis Warpachowskyi, G. 0. Sars, n. sp. 

 (PI. VII.) 



Specific Characters. — Body (see PI. VIT, fig. 1 and 21) of rather robust 

 form, and having the anterior division somewhat tumefied. Carapace deeply 

 emarginated posteriorly, leaving the dorsal part of the last 2 segments of 

 mesosome quite uncovered, cephalic part fully as broad as the 1 st segment 

 of metasome, and having the anterior edge (see fig. 2) rather produced in 

 the middle, forming a distinct, nearly right angle, which, however, does not 

 quite obtect the frontal spine. Metasome not much prolonged, and rather 



iiullotin N. S. IV (XXXYI) p. 65. 29 



