T. XIIl] J CRUSTACEA CASPIA. 409 



those in the preceding species, though being perhaps a little smaller and 

 somewhat more obliquely truncated at the tip, terminal part (6g. 4) in front 

 of the outer corner occupying about % of the length of the scale, apical 

 segment well-defined. Pereiopoda (fig. 6) of a similar structure as in M. 

 Ullskyi, but having the meral joint comparatively shorter, and the tarsal 

 part much longer than the latter. Outer ramus of the 3rd pair of pleopoda 

 in male (fig. 11) exceeding half the length of the inner; 4th pair (figs. 10 

 and 1 2) reaching beyond the tip of the telson, and having the exterior flagel- 

 lum nearly of same length as the stem of the ramus. Telson (fig. 7) scarcely 

 longer than the last segment of metasome, and having the outer part slightly 

 attenuated, lateral edges somewhat flexuous and armed each with from 18 

 to 20.spinules, the outermost of which is not far remote from the tip, apical 

 sinus (see fig. 9) well-defined, though not very deep, and bordered with 

 about 22 regular dentiform projections, terminal lobes, as usual, tipped 

 by a somewhat larger spine. Inner lamella of the uropoda (fig. 8) moderately 

 tumefied at the base, with the otolith rather large, inner edge armed, 

 below the marginal setse, with about 9 slender spines, the outer 2 of which 

 are placed at some distance from the others. Body everywhere ornamented 

 with finely dendritic ramifications issuing from a dorsal row of pigmentary 

 centres, arranged in the usual manner. Length of adult female reaching 

 18 mm. 



JRemarhs. — Although I have not had an opportunity of examining 

 the type specimens of Czerniavsky, which were wanting in the collection 

 sent to me, I cannot doubt that the above described species is that so named 

 by the said author, as it agrees rather well with his description and figures. 

 It is easily distinguishable from the preceding species by its much shorter 

 and stouter form of body, and the richly dendritic pigmentary ornament of 

 the dorsal face, as also by the comparatively shorter telson. 



Occurrence. — Three specimens of this form, 2 females and 1 male, 

 were contained in the collection of Warpachowsky, and occurred at Stat. 

 28, north of the peninsula Mangischlak 1 ). To judge from their size, they 

 would seem to belong to the „varietas major" of Czerniavsky, which has 

 not yet been recorded from the Caspian Sea. — According to Mr. Czer- 

 niavsky, numerous specimens of the smaller form (forma typica) were col- 

 lected by Prof. Kowalevsky at Petrowsk or Baku, close to the shores. 



Distribution. — According to Mr. Czerniavsky, the larger form of 

 this species (var. major) has been recorded from 2 different localities of the 



1) In a subsequent collection by the same naturalist this species was rather abundantly 

 represented in 2 other places, viz., at Stat. 49, between the island of Kulaly and that of Mor- 

 skoj, and 52, at the northern extremity of the island Swjatoj. 



Bulletin N. S. IV (XXXVI) p. 61. 



