1917. 



S. Kemp : Notes on Crnstacea Decapoda. 



253 



species, however, the carapace is stated to be triangular, with only 

 two teeth on the lateral border, and the median tooth of the 

 rostrum points obliquely upwards, instead of being depressed as 

 in R. wjood-masoni. The carpus of the chelipedes bears on its 

 upper surface three or four small teeth; in adult males of R. wood- 

 ntasoni one such tooth is sometimes found near the meral articula- 

 tion, but it is frequently absent. Stimpson states that each joint 

 of the ambulatory feet, except the dactyli, is " dentigerous in the 

 middle," a character not found in R. i&ood-masoni or in any other 

 species of the genus that I have seen. 



The only specimens of this species in the Indian Museum are 

 those described b}^ Alcock from the Andamans and from Port 

 Canning near Calcutta. 



Fig. 



-Rlivncliopldx alcocki. sp. nov. 



Rhynchoplax alcocki, sp. nov. 



The carapace is subcircular, a little produced anteriorly and 

 with its sides slightly flattened and nearly parallel. Its breadth 

 is almost equal to its length, excluding the rostrum. The surface 

 is hairy and sunken and the usual grooves are well defined. The 

 entire margin is upturned and is continuous from side to side 

 across the base of the rostrum. A sharp post-ocular tooth is vis- 

 ible in dorsal view and behind it, on the margin itself, there is a 

 blunt tooth corresponding to the foremost of those found in R. wood- 

 masoni (text-fig. 4^). Below the margin near the base of the first 

 pair of walking legs there is a huge tooth-like process directed for- 

 wards, upwards and outwards. 



