246 OCYPODE CERAÏOPHTHALMA. 



the crabs agreeing for the rest wholly with one another. 

 There are patches of thick hair on the under surface of 

 the penultimate joints of the second and third legs and the 

 musical ridge on the inner surface of the larger hand of 

 the male consists of numerous small secondary transverse 

 ridses, that are more crowded on the under half of the 

 ridge but separated by larger intervals on the upper half 

 and change even gradually into small tubercles at the 

 upper end. 



This species however presents many most remarkable 

 (perhaps local) varieties as regards the general physiogno- 

 my of the upper surface of the carapace , caused by a dif- 

 ferent course of the lateral margin of it , varieties that seem 

 to have heen regarded by Milne Edwards and others as 

 different species. In all specimens however the external 

 orbital angles , directed transversely outward , do not pro- 

 ject beyond the bottom ())fond" Milne Edw.) of the exter- 

 nal portion of the very oblique supraorbital margin and 

 are situated very much behind the bottom of its internal 

 portion. But the epibranchial angle, that lies there where 

 the lateral margin is crossed by the oblique granular line 

 on the lateral surfaces of the cephalothorax , projects more 

 or less outward than the external orbital angle. So in the 

 Nossy-Faly and also in the Xulla-Bessy specimens the ex- 

 ternal orbital angle projects more outward than the epi- 

 branchial, the lateral margin being therefore nearly straight 

 and directed obliquely backwards , but in the adult Amoy 

 specimens and in that of the Philippines the epibranchial 

 angle projects more than the external orbital , the lateral 

 margin being consequently more arcuated , the whole upper 

 surface of the carapace appearing to be broader than that 

 of the Nossy-Faly specimens. To^this variety with relati- 

 vely broader carapace perhaps belong the Oeyi')- platytarsis 

 Lam. and Ocyp. hrevicornis M. Edw. But the specimen of 

 Amboina and even a young from Amoy present a remar- 

 kable transition , the external orbital and the epibranchial 

 angles equally projecting outward. 



Notes from the Leyden JMuseuni, Vol. 111. 



