206 Carcinological Fauna of India. 



elevations. On the cardiac region, and also on the intestinal region, in 

 the middle line, an acuminate eminence. 



The rostrum consists of two divergent spines, about one-third the 

 length of the rest of the carapace. 



The eyes stand •well oat from beneath the pre-ocular spine, and 

 are retractile against a small post-ocular tooth. 



The other appendages closely resemble those of the preceding 

 species ; but the chelipeds, in the adult male, are shorter, being only 

 equal in length to the carapace and rostrum, and the fingers have their 

 cutting edges crenulate instead of smooth. 



In females and in young males the chelipeds have the same re- 

 lative proportions as in Scyramathia beauchamjoi. 



Male. Female (adult). 



Length of carapace (including rostrum)... 17 millim.... 13 millim. 



Greatest breadth of carapace... ... 10 „ ... 7*5 „ 



Length of cheliped ... ... 18 „ ... 9*5 ,, 



Greatest breadth of palm ... ... 4 ,, ... 1*2 „ 



Loc. Andaman Sea, 130-240 fathoms. 



Miers Pugettia velutina ('Challenger' Brachyura, p. 4J, pi. vi. 

 figs. 2, 2a, 2b) should, I think, be placed in this sub-genus — Scyramathia. 



Htastenus, White. 



Myastenus, White, P. Z. S., 1847, p. 56. 



Eyastenus, Miers, Journ. Linn. Soc., Zool., Yol. XIV. 1879, p. 658 (et synon.) j 

 and ' Challenger ' Brachyura, p. 55. 



Chorilia and Lahainia, Dana, U. S. Expl. Exp. Crust. I. pp. 91 and 92. 



Carapace subpyriform, convex, either smooth or tuberculate, some- 

 times spiny. Supra-ocular eave very prominent, usually somewhat 

 acuminately produced anteriorly : post-ocular spine, or lobe, large and 

 excavated. The rostrum consists of two usually long slender divergent 

 spines. Eye-stalks short, retractile against the post-ocular lobe, but 

 never to the complete concealment of the cornea. 



Basal antennal joint broad, its antero-external angle sometimes 

 produced : the mobile portion of the antenna usually exposed to dorsal 

 view. 



Merus of the external maxillipeds as broad as, or broader than, 

 the ischium, expanded at the antero-external angle, and bearing the 

 palp at the antero-internal angle. 



52 



