1901.] CEUSTACBA OF THE " 3KBAI EXPEl>ITION." 547 



border being only slightly curved, and its posterior border practi- 

 cally straight and in line with the postero-lateral border of the 

 carapace ; it is also sharp, and a little smaller than the tooth in 

 fi'ont of it. The postei'o- lateral border is straight, inwardly 

 directed, and scored with irregular oblique rugosities, which 

 extend only the least distance on to the carapace. 



The frontal ridge is very prominent and sharp, and composed of 

 t\A quite distinct portions : an outer, starting from the last epi- 

 branchial tooth, aud extending inwards and slightly forwards, with 

 a faintly sinuous course, to within 2-3 mm. of the mesogastric 

 suture ; and an inner, lying as far in front of the outer as this 

 does from the mesogastric SLiture, and starting internally from the 

 fore part, here rather deep, of the mesogastric suture, and extending, 

 faiatly crescent-shaped with forwardly directed concavity, to the 

 level of the external angle of the front, its anterior border shelving 

 very sharply down to the front. 



The surface of the carapace is everywhere punctate, the punctse 

 being distinct and fairly disparate ; the cardiac suture is well 

 defined, and the gastric region in front of it is slightly tumid, and 

 a very broad distinct uru-cardial suture is also present. The 

 mesogastric suture starts at the level of the inner frontal ridges, 

 and disappears just behind the level of the outer frontal ridges. 



The chelipedes are quite smooth, with a small spine near the 

 distal end of the upper margin of the merus, and a strong spine 

 at the upper inner angle of the carpus ; the lingers are as long as 

 the palm, and slightly gaping, with a row of tubercular teeth on 

 their inner edges, two or three of which are bigger than the rest ; 

 their tips are somewhat hooked and cross each other. 



The tour posterior legs present no noteworthy features, ex- 

 cepting tliat the meri of all bear a fairly strong spine at the distal 

 ends of their upper edges, and the carpi carry a ridge along the 

 middle of iheir hinder surfaces ; in the last pair, however, this 

 I'idge is rounded and inconspicuous. 



Special interest attaches to this species from the fact that this 

 individual carries beneath the abdomen, attached to the swim- 

 merets, a number (about 100) of young, all of which are fully 

 formed, i. e. present the structure of the adult. Such an occurrence 

 has, I believe, never been observed in any other crab, and it points 

 to a quite unusual abbreviation of the metamorphosis, though to 

 what exact extent it is, at present, impossible to say ; while the 

 causes of the abbreviation in this case are equally unknown. 



Dim. 37 X 21-5. 



35. POTAMON (POTAMONAUTES) STOLICZKASTUM W.-MaSOU. 



Teljpliusa stoliczkana, W. -Mason, Journ. As. Soc. Beng. xl. p. 199, 

 pi. xii. fig. 8 (1871). 



Loc. Lacom. 



Pive females and a smaller male. 



1 have only to notice that the " bayiug " of the front is quite 

 inconsiderable in these specimens, though more apparent in some 



