1901.] CIl USTACEA OF THE " SKEAT EXPEDITION." 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 

 front of it. The postero-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 aud sharp, and composed of 

 two quite distinct portions : an outer, starting from the last epi- 

 branchial tooth, and extending inwards and slightly forwards, with 

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

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

 does from the nasogastric suture, and starting internally from the 

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

 faiutly 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 puncta) 

 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 uro-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, aud 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 

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

 their tips are somewhat hooked and cross each other. 



The four posterior legs present no noteworthy features, ex- 

 cepting that the uieri 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 their hinder surfaces ; in the last pair, however, this 

 ridge 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 LOO) of young, all of which are fully 

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

 has, 1 believe, never been observed in any other crab, and it points 

 to a quite unusual abbreviation of the metamorphosis, though tu 

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

 causes of the abbreviation in this case are equally unknown. 



Dim. :i7x 21-5. 



'.!». PoTAlION (IVlAMoNAl Mm STiiMc/KANI M W.- .Mason. 



Tetohusa ttoliczlcana, W.-Mason, Journ. A.s. Soc. Beng. xl.p. 199, 

 pi. xii. fig. 8(1871). 

 Loc. Lacom. 

 Five females and a smaller male. 



I have only to notice that the " baying " of the front is quite 



inconsiderable in these specimens, though more apparent in some 



