270 



hepatic region, and a third in the branchial : the posterior margin is strongly 

 spinate : on the gastric region are two pairs of spines — a large pair in front, and 

 a small inconspicuous pair behind : on the cardiac region also is a pair of small 

 spines. 



The abdominal terga are unarmed. 



The eyestalks, which are slightly mobile, are prolonged internally beyond 

 the cornea to form a spine. The meropodite of the external maxillipeds has its 

 inner edge faintly serrated. The chelipeds are rather shorter than the ambula- 

 tory legs, and have short broad hands. The 2nd-4th legs have dactyli of the 

 usual form. 



No epipodites are present on any of the thoracic legs. 



Length of fully extended body 27'5 millim., of chelipeds 15 millim. Bay of 

 Bengal, 1520 fathoms. 



Regd. No. -= (Type of the species). 



40. Munidopsis {Orophorhynchus) centrina, 



Alcock & Anderson. 



Munidopsis centrina, Alcock and Anderson, Journ. Asiatic Soc. Bengal, Vol. LXI1I. pt. 2, 1894, p. 170. 

 Illustrations op the Zoology of the Investigator, Crustacea, Plate XI. Fig. 6. 



Belongs to the group Mtmidopsis abbreviata, A. M.-E., ill. brevimana, 

 Hndrsn., M. ciliata, W.-M., and M. vicina, Faxon. 



The carapace and appendages are remarkably acutely spinose, besides bear- 

 ing many long coarse stiff setge. 



The carapace is strongly semi-elliptical, and is about three times the length 

 of the narrow, depressed, acute, simple, carinated, rostrum. The strongly convex 

 frontal margin bears four spines, a large one above the antenna on each side, and 

 a smaller one between and behind this and the antero-lateral spine : the lateral 

 margins are armed with 5 large spines besides the antero-lateral spine, 3 of 

 which are in the hepatic, and 2 in the branchial region : the posterior margin is 

 raised but smooth : on the gastric region are two transverse rows of spines, four 

 in each row, those of the middle pair of the front row being about two-thirds the 

 length of the rostrum. 



The abdominal terga are unarmed, but deeply grooved transversely. 



The eyestalks are short and immobile : their lower, their outer, and their 

 inner border are all prolonged as spines beyond the cornea, the inner spine being 

 more than half the length of the rostrum. The spines of the antennulary and 

 antennal peduncles are of remarkable size. The meropodite of the external 

 maxillipeds is faintly three-toothed along the inner edge. The chelipeds 

 are rather shorter than the ambulatory legs : they are acutely spiny up to the 



