CBTTSTACEA OF THE MEEGUI AECHlPELAaO. 107 



crabs presents a somewliat different appearance from the ceplia- 

 lothorax of X murigera, I am inclined to regard tliem. as a distinct 

 species. They differ from it in tlie following characters : — The 

 crests or ridges are rather rounded and not thin or acute, and the 

 anterior curls are indistinct or quite absent ; they also pass into 

 the raised, broad, and nearly straight, posterior margin, which 

 projects much more backwards than in X. murigera, and forms 

 a right angle with the lateral margins. The length of the 

 carapace in these specimens therefore measures more than the 

 distance between the raised lateral margins. 



The legs also are more elongated and more slender than in 

 typical representatives of X murigera, all the joints presenting 

 this character, especially the hands and the meropodites, carpo- 

 podites, and propodites of the ambulatory legs. 



The integument not being strong and solid, but rather pliant 

 and similar to parchment, I am inclined to regard the different 

 shape of the carapace as an individual variety. I do not venture 

 to decide this question, but, as the legs are also more slender 

 and more elongate than those of Xanthasia murigera, these 

 specimens may perhaps prove to represent a distinct species, for 

 which I would propose the name of Xanthasia Whitei. 

 Dimensions of the larger ova-bearing specimen : — 



Length of the cephalothorax 14 millim. 



Distance between the raised lateral margins . . 12| „ 

 Length of the legs of the antepenultimate pair 22 „ 

 Length of the hands, the fingers included .... 7 ,, 



Grenus Octpoda, JFahr. 



69. Octpoda ceeatophthalma, Pallas. 



Cancer ceratophthalmus, Pallas, Spicil. Zool. fasc. ix. p. 83, pi. v. 



fig. 17 (1772). 



Ocypoda ceratophthalma, Fabricius, Suppl. Entom. Syst. p. 347 ; 

 Milne-Edwards, Hist. Nat. des Crustaces, t. ii. p. 48, and Ann. Sci. Nat. 

 3« serie, t. xviii. p. 141. 



Ocypoda ceratophthalma, de Man, Notes from the Leyden Museum, 

 vol. iii. 1881, p. 245. 



Ocypoda ceratophthalma, Miers, Ann. 8f Mag. Nat. Hist. 5th ser. vol. x. 

 1882, p. 379. 



Twenty specimens of this common Indian species were col- 

 lected, all being very young, except one nearly adult female. 



