﻿CRUSTACEA MALACOSTRACA. II. uq 



deep; fourth joint somewhat shorter than the two precediujj joints combined and much shorter tlian the 

 longest terminal seta. — AntenuLe of middle length; second and third joints uncommonly long; fourth 

 and fifth joints completeh' fused, about twice as long as the si.xtli joint. 



Chelipeds (fig. 5b) moderately strong. Basal joint somewhat more than half as long as the 

 carpus, with the posterior protuberance deep but short, its hind margin free and rounded and reaching 

 somewhat behind the front lower angle of second thoracic segment. Carpus somewhat long, .slightU' 

 more than twice as long as deep, with the lower margin distincth' convex. Chela as long as the 

 carpus, slightly more than twice as long as broad, with the hind margin somewhat concave; movable 

 finger somewhat short, very much shorter than the anterior margin of the hand, moderatelv strong; 

 fi.xed finger with a single long seta on the posterior margin at its base, and with a more pro.ximal, 

 triangular protuberance and a more distal triangirlar tooth on the incisive margin. 



Thoracic segments, seen from abo\e (fig. 5a), as to relative length and the shape of the lateral 

 margins in the main similar to those in S'. cylindrata. The lateral margins of the second segment are 

 rather convex; the three anterior segments together a little shorter than fifth and sixth segments 

 combined. — Thoracic legs of moderate length and thickness. The two anterior pairs (fig. 5b) liave 

 fourth and fifth joints snbequal in length and proportionately short, together as long as the sixth 

 joint, which is somewhat longer than seventh with claw, and on these legs the spines are ver\- short 

 or parti)' wanting. Three posterior pairs somewhat similar to those of thick-legged specimens of 

 .S'. cyliiidrnta. 



Abdomen onh' as long as seventh, sixth, fifth and half of the fotntli thoracic segments com- 

 bined; si.xth segment as long as the three preceding segments together, its posterior margin is some- 

 what convex with an obtuse median angle (fig. 5 a). Pleopods proportionately long (fig. 5CI; the 

 exopod much longer than the peduncle and somewhat longer than the endopod; the terminal setae 

 longer than the rami. — Uropods not much more than half as long as sixth segment, moderateh' 

 robust (fig. 5c); peduncle short and thick, much deeper than long; endopod with the proximal joint 

 twace as long as the distal; exopod about half as long a.s and much thinner than the proximal joint 

 of the endopod. 



Length of the single specimen 1.05""". 



Female (without marsupium). As the single specimen is .so curved that 1 did not venture 

 to make an attempt to straighten it, the description of the species has been based on the subadult 

 male, and some remarks on the female may be added. 



The specimen is rather similar to the male in most respects, but differs in some minor parti- 

 culars. As far as can be judged the specimen is somewhat more slender in proportion to length than 

 the subadult male. 



The carapace is considerably shorter than the three following segments combined. — The an- 

 tennuUe (fig. 5d) are somewhat longer than the carapace, slender; the first joint is three times as 

 long as deep; fourth joint is distinctly .shorter than the second. — Chelipeds with the carpus about 

 half as long again as the ba.sal joint and nearly twice as long as deep; chela somewhat more than 

 twice as long as broad, with the movable finger proportionatelv a little longer than in the male; the 



