251 



2. No epipodites on chelipeds or legs : — 



i. Posterior border of carapace spinifcrous rostrum styli- 



form, with lateral spines ... ... ... M. arietina. 



ii. Posterior border of carapace smooth : rostrum short, 

 simple : — 



a. No spines on the gastric region ... ... M. ceratophthal- 



mus. 



b. Two transverse rows of spines on gastric region M. centrina. 



Group IV. (Elasmonotus) contains a single species. 



Key to the species included in Group V (Bathyankyristes). 



I. Rostrum more than half the length of the carapace : much of the eyestalks 



is visible in an ordinary dorsal view ... ... ... M. tenax. 



II. Rostrum half the length of the carapace : only the eyes are visible in a 



dorsal view, not the eyestalks ... ... ... ... M. levis. 



20. MUTlidopsis Hemingi, Alcock & Anderson. 



Munidopsis hemingi, Alcock and Anderson, Ann. Mag. Nat. Hist.. Jan. 1899, p. 19. 

 Illustrations of the Zoology of the Investigator, Crustacea, Plate LV. Fig. 4. 



Near M. ornata, Faxon. 



Carapace convex, broader behind than in front, covered with squamiform 

 tubercles in no very conspicuous transverse arrangement, the regions well 

 defined ; a pair of tubercles on the anterior part of the gastric region are acute. 



Rostrum short, simple, triangular, carinate; anterior border of carapace 

 with a blunt tooth, antei'o-lateral border cut into three teeth, posterior border 

 unarmed. 



Abdomen unarmed, smooth, the second and third terga transversely 

 bicarinate. 



Byes slightly movable, a tiny papilliform spinule at their inner angle. 



Inner border of merus of external maxillipeds armed with two large spines. 



Chelipeds in the female (male unknown) equal, as long as the extended body 

 without the telson and longer than the legs by their finger-length ; their dorsal 

 surfaces are covered with squamiform markings, the only spine is a small one 

 near the distal end of the inner border of the wrist ; the fingers are as long as 

 the palm. 



The first three pairs of legs have the dorsal surfaces of the meropodites and 

 next two joints covered with squamiform markings ; the dactyli are about half 

 the length of their propodites. 



Epipodites are present on the chelipeds and three next pairs of legs. 



