1916.] S. Kemp: Notes on Crustacea Decapoda. 361 



development of this appendage there were marked sexual differ- 

 ences. The condition in P. sculptus is, in fact, precisely the same 

 as has been described above in the case of the related Indian form. 



As regards the characteristic tooth on the outer edge of the 

 antennal scale, I noted, in the paper cited above, that it was 

 apparently absent in a single Mediterranean example of P. sculp- 

 tus preserved in the Indian Museum. Further examination of 

 this individual shows that the tooth is indeed present, but situated 

 at the proximal end of the scale. The specimen is, in fact, in all 

 points identical with the types of P. incisus and differs from P. 

 scz^Z/'iJws in the characters noted above. It is labelled "Mediter- 

 ranean" without more precise localit}' and is said to have been 

 received from E. Cornalia, from whom Wood-Mason obtained a 

 large number of Mediterranean Decapoda. From Heller's descrip- 

 tion,* however, it seems clear that the true P. sculptus occurs in 

 the Mediterranean, for in his description of the antennal scale he 

 says "am Seitenrande ausser dem endstandigen stachel mit einem 

 zweiten beilaufig in der Mitte." It is probable therefore that 

 some mistake has arisen and that the specimen, said to have been 

 found in the Mediterranean, was in reality obtained in Indian 

 waters. 



In life Pontophilus mcisus is closely mottled with dark grey 

 and brown, the colouration being apparentl}^ protective. 



All the specimens in the collection are from the Andaman Is. — 



—-^^ Andamans, 20 fms. 'Investigator.' i, 10 mm. 



-9-°-fg^^^ Port Blair, Andamans, S. Kemp. 41, 7-18 mm. 



2-12 fms. 



The specimens from Port Blair, among which the types of the 

 species (9070/ ro) are included, were obtained in the channel off 

 Ross I. on a rough bottom composed of sand, stones, shells and 

 coral. 



Pontophilus lowisi, sp. nov. 



(Plate viii, fig. 2.) 



The rostrum is longitudinally channelled above ; its lateral 

 margins are curved and strongly divergent distally. The anterior 

 margin is very broad and, in dorsal view, a little concave. The 

 true apex is sharply deflexed ; it has a rounded margin and is 

 visible only froin in front. 



On the carapace there is no trace of the transverse groove be- 

 hind the rostrum which occurs in most species. In the mid- dorsal 

 line there is a longitudinal carina which extends close up to the 

 base of the rostrum. Throughout the greater part of its length 

 this carina is obscure; but for a short distance just behind the 

 middle of the carapace it is sharp and well defined and owing to 

 its greater elevation is distinct in lateral view. A feeble groove 

 runs obliquely forwards and downwards on either side of the cara- 



Heller, Crust, si'td/icli. Eiiropa, p. 228 ('1863'). 



