269 



The antennal flagellum is three times as long as the cheliped. 



The external maxillipeds are short and slender, the ischium having the inner 

 border finely ctenate and the meropodite having the lower border irregularly 

 crenulate. 



The thoracic legs are granular, or squamous, or spinulate, and moderately 

 hairy. 



The chelipeds are shorter and not very much stouter than the second, third, 

 and fourth legs, their length being considerably less than half that of the body 

 (with the rostrum) ; in the male they are slightly asymmetrical ; the meropodite 

 and carpus have each a terminal ring of spinelets, and the fingers, which are 

 longer than the inflated palm, are coarse, and are excavated en cuillere at tip, 

 being closely crenulate round both edges of the spoon-shaped tips, but not 

 toothed in the proximal half. 



The second, third, and fourth thoracic legs have the joints remarkably 

 prismatic and the carpus and propodite strongly fluted ; in all the anterior border 

 of the meropodite and carpopodite is spinate, and the teeth on the posterior 

 border of the dactylopodite are small, the dactylopodites being more than half as 

 long as the propodites. 



The chelipeds carry a large epipodite. 

 Colour in life brilliant white. 



In the male the length of the fully extended body is 59 millim., that of the 

 chelipeds is 36 millim. 



Bay of Bengal, 1803 fathoms. 



This variety appears to differ from the type in having only a pair of gastric 

 spines and in the greater distinctness of the cardiac region. 



Eegd. No. f. 

 39. Munidopsis (Orophorhynchus) arietina, Alcock. 



Munidopsis arietina, Alcook and Anderson, Jonrn. Asiatic Soc. Bengal, Vol. LXIII. pt. 2, 1894, p. 171. 

 ILLUSTRATIONS OF THE ZOOLOGY OF IKE INVESTIGATOR, CRUSTACEA, PLATE XII. FIG. 3. 



Belongs to the Munidopsis abbreviata and brevimana group, but is dis- 

 tinguished from all its congeners by its enormous up-curved spiny Heterocarpus- 

 like rostrum. 



Carapace semi-elliptical. The rostrum, which is acutely styliform and 

 strongly up-curved, is equal in length to the carapace, its tip reaching almost to 

 the end of the fully extended chelipeds : its sides are acutely but unsymmetri- 

 cally spinate. 



The convex frontal margin is unarmed, except for the antero-lateral spine : 

 the lateral margins besides this spine are armed with a second spine in the 



