(XXXVI) | CRUSTACEA CASPIA. 309 
markable by the occurrence in its outer part of 5 strong, recurved hooks, 
wholly wanting in the female, and probably subservient in getting hold of 
the female during copulation. 
The first 2 segments of the metasome have each (see fig. 2) a pair of 
ventral appendages (pleopoda), of which no trace is to be found in the female. 
The anterior pair are much the larger, and consist each (fig. 9) of a lamel- 
lar basal part and a short terminal joint or ramus. The basal part slightly 
tapers distally, and has on the inner edge a series of 8 very strong and 
curved plumose setæ; outside occur moreover 2 somewhat shorter, but very 
densely ciliated setæ. The terminal joint is rather small and obliquely trun- 
cated at the tip, which carries 5 plumose setæ of moderate length. 
The posterior pair of pleopoda (fig. 10) are very small and rudimentary, 
and have the form of 2 apparently quite immobile, claviform appendages, 
without any sete, but each armed with a strong spine near the extremity 
outside. At the tip of each of these appendages occurs an extremely minute 
and pellucid terminal joint, or ramus, projecting in 3 fine hairs. 
The 3 succeeding segments of the metasöme have each, on the place 
where, in the 2 anterior segments the pleopoda occur, 2 strong ciliated sete, 
of which no trace is to be found in the female. 
The uropoda (fig. 11) exhibit a similar structure to those in the female, 
differing however in the scape having a much greater number of sete, and 
in the inner ramus being provided along the proximal half of the inner edge 
with a dense series of short ciliated spinules. ` 
The telson (fig. 12) does not exhibit any essential difference from that 
in the female. 
Colour. — Although the colour, as a rule, cannot be stated in alcoholic 
specimens, it may be observed, that some specimens, both males and females, 
received immediately after having been collected, still exhibited a most 
beautiful ornament of reddish brown arborescent pigmentary patches, espe- 
cially on the carapace. The number and arrangement of these patches seemed, 
however, to be somewhat variable. They are indicated on the habitus-figures 
here given, as they occurred in the specimens delineated. 
Occurrence. — The present species is by far that most abundantly repre- 
sented in the collections of Mr. Warpachowsky. It has been collected in 
no less than 15 different Stations, distributed chiefly in the western part of the 
North Caspian Sea, as also north of the peninsula Mangyschlak. In some 
of the Stations (as St. 2 and 47) it occurred in great profusion, both adult 
females, males and young being present, in others now males, now females 
were the more predominant. 
Distribution. The Sea of Azow (Sowinsky). 
Melanges biologiques. T. XIII, p. 473. 21* 
