ig22.] S. Kemp : Notes on Crustacea Decapoda. \2j 



(i) There is no vestige of the supra-orbital spine, though the 

 orbit has a bevelled edge as in the allied species. 



(ii) The spine at the end of the merus of the second peraeopod 

 is quite terminal in position. 



(iii) The dactylus of the last three peraeopods is much shorter, 

 the nropodite being from 53 to 5'5 times its length. 



v hese characters are not very convincing. It is possible that 

 ot. distinctive features will be found in the second peraeopods 

 of the male, for I have only seen one detached leg of the second 

 pair in P. pottsi and this appears to belong to a female. 



Palaemonella pottsi is purple in colour when alive and is asso- 

 ciated with crinoids. whereas P. vestigialis is not conspicuously 

 coloured in life and is free-living. There were no crinoids in the 

 localities where the latter species was collected at Port Blair. 



The species is known only from the Murray Is. in the Torres 

 Straits. 



Palaemonella lata, sp. nov. 



This species, which is represented by a single adult male, is 

 closely allied to P. vestigialis and P. pottsi but differs in the 

 following characters: — 



(i) There is no vestige of the supra-orbital spine (text-fig. 3). 



Text-fig. 3. — Palaemonella lata, sp. nov. 

 Anterior part of carapace. 



(ii) The lateral process of the antennular peduncle is longer, 

 extending beyond the middle of the segment and the terminal 

 spine of the basal segment is also longer, reaching much beyond 

 the middle of the second segment (text-fig. 4^7). 



(iii) The outer antennular flagellum is more deeply cleft. The 

 free portion of the stouter ramus is as long as the fused basal 

 part, the latter comprising only 5 segments (text-fig. 4a). 



(iv) The distal end of the antennal scale is very much broad- 

 er and the terminal spine reaches scarcely at all beyond the apex 

 of the lamella (text-fig. 4b). 



(v) The fingers of the first peraeopod are equal in length with 

 the palm. 



(vi) There is no spine at the distal end of the merus of the 

 second peraeopods (teyt-fig. 5ft). 



In other respects there is little difference. The rostrum 

 reaches beyond the end of the antennular peduncle and is rather 



