57. 



The antennae are in all respects as in M. squvuido, except that the basal 

 joint is slightly narrower. 



The appendages are just as in M. squinado — the legs being short and hairy 

 and the chelipeds smooth and polished — with the single difference that the 

 chelipeds are only as long as, and are much slenderer than the last pair of legs, 

 and are therefore very much shorter than the first pair, which hardly exceed 

 the carapace and rostrum in length. 



Male. Female. 



Length of carapace ... ... 32 millim. 41 milhm. 



Greatest breadth of carapace ... 25 „ 35 „ 



Length of chelipeds ... ... 24 „ 31 „ 



„ „ 1st pair of legs ... ... 33'5 „ 46 „ 



From the Andaman Sea, 250 fms. 



COEYSTOIDEA. 

 Tbichopeltaeium, a. M. Edw. 



Triehopeltarium, A. Milne Edwards, Ball. Mae. Comp. Zool., Vol. VIII. 1880, p. 19. 



Said to differ from Hypopeltarium in having the carapace strongly convex 

 and hairy and the chelipeds, in the male, very greatly unequal. 



? Triehopeltarium ovale, Anderson. 



f Trickopeltariv,rK ovale, Anderson, J. A. S. B. Vol. LXV. pt. 3, 1896, p. 103: III. Zool. Investigator, Cruet. 

 pi. ZXT. figs. 4, 4a. 



Carapace egg-shaped, covered with spines which on its dorsal surface are 

 bifid or multifid, and with short stiff not very conspicuous hairs. The regions 

 are well defined by coarse grooves : the gastric is divided into three sub-regions, 

 and the cardiac into two, and on either side of the cardiac region a semilunar 

 area is marked off on the branchial region. 



The front, which is cut into three prongs, is about one-seventh the greatest 

 breadth of the carapace, and is separated from the orbit by a deep notch. 



The orbits are very incomplete : they are formed by a prominent prgeocular 

 tooth (parallel with, but less prominent than, the front), below which, at the 

 inner suborbital angle is an almost equally prominent coarse spine : there are also 

 two teeth — one at the external orbital angle, and the other between this and the 

 praeocular tooth — hardly distinguishable from the ordinary spines of the cara- 

 pace. The eyestalks which are slender, tapering, and of good length, do not 

 nearly fill the shallow orbital cavity. 



The antennules fold longitudinally in fossae, beneath the front : their basal 

 joint is large. The antennae arise almost in the same transverse line with the 

 antennules : their basal joint forms a large part of the floor of the orbit. 



