56 



CRUSTACEA MALACOSTRACA. II. 



34. Typhlotanais plebejus n. sp. 

 (PI. V, figs. 8a-8g.) 



Female (without niarsupium). Body slender, almost eight times as long as broad, seen from above 

 cylindrical (fig. 8 a). — Carapace half as long again as broad and nearly longer than second, third and 

 half of the fourth segment combined; the posterior halves of the lateral margins parallel, the anterior 

 halves converging and distinctly convex; the front end somewhat more than half as broad as the 

 carapace and the rostral process moderately developed, acute. 



Antennulse short, considerably shorter than the carapace. First joint (fig. 8 b) somewhat longer 

 than the two other joints combined, about three times as long as deep and moderately tapering from 

 somewhat from the base to the end, seen from above nearly regularly tapering and about two and 

 a half times as long as broad. Second joint slightly longer than deep; third joint about three times 

 as long as the second, only moderately slender; terminal setse a little shorter than third joint. — An- 

 tennae somewhat long; third joint conspicuously thickened; fourth joint twice as long as the penul- 

 timate; terminal setse somewhat shorter than those of the antennulse. 



Chelipeds (fig. 8c) rather robust. Basal joint very long, because the posterior protuberance is 

 very elongate, more than half as long again as deep; carpus slightly longer than the basal joint, 

 not fully two and a half times as long as deep. Chela somewhat small, somewhat shorter than the 

 carpus and a little less than three times as long as broad, with the posterior margin conspicuously 

 concave; movable finger somewhat shorter than the anterior margin of the hand; fixed finger at the 

 base somewhat broader than the movable, with a low protuberance on the incisive margin a little 

 from the end. 



Thoracic segments all rectangular (fig. 8 a), increasing in length from second to fifth and de- 

 creasing from fifth to seventh; second segment slightly shorter than the third, without ventral process; 

 fifth segment considerably longer than the fourth and slightly longer than broad. Thoracic legs 



on the whole somewhat short and robust. Second pair (fig. 8d) with fourth joint as long as the sixth 

 joint; all setse short. Third pair (fig. 8e) considerably shorter than second; fifth joint slightly longer 

 than the fourth and not much shorter than the sixth, which is more than twice as long as seventh 

 joint with claw; setse short or moderately short. Fifth pair (fig. 8f) with second joint much expanded, 

 scarcely twice as long as broad; fourth and fifth joints uncommonly broad and short; sixth joint 

 slender and almost as long as fifth and fourth joints combined; seventh joint somewhat long and thin 

 with a fine, curved claw. (Sixth and seventh pairs mutilated). 



Abdomen almost as long as seventh, sixth and half of fourth thoracic segment combined. — 

 Uropods somewhat short (fig. 8g); endopod distinctly two-jointed, with the first joint considerably 

 longer than the second; exopod nearly as long as the proximal joint of the endopod, one-jointed. 



Length of the single specimen 3.19 nim . 



Remarks. T. plebejus is allied to T. cequiremis Lilljeborg and T. assiinilis G. O. S., but it is 

 instantly distinguished from both by shorter chelse, by having the exopod of the uropods one-jointed 

 and especially by the very long posterior protuberance on the basal joint of the chelipeds. By the 

 last-named character it is distinguished from all other species of the genus. 



