1916,] S. Kemp : Notes on Cviistacea Dccapoda. 379 



single retrorse spine behind the middle point of each of the sub- 

 median carinae of the last abdominal somite. The spines on the 

 first two abdominal somites, if their presence proves to be con- 

 stant, will also serve to distinguish the two forms. 



I think it improbable that the specimens from deep water off 

 the Hawaiian Is., recorded by Miss Rathbun as Egeon orientalis ', 

 are correctly referred to this species. In the examples in the 

 Indian Museum the middle tooth of the median carina of the cara- 

 pace is not smaller than the rest and the denticulation of the second 

 lateral and marginal carinae is also different. Moreover, the third 

 and fourth abdominal somites though strongly sculptured, only 

 bear a single lateral longitudinal carina. These carinae, which 

 are submedian in position and are clearly shown in Henderson's 

 figure, are sinuous and towards the hinder end of the somite are 

 directed oblir|uely outwards; that on the third is entire, while 

 that on the fourth is interrupted in the middle. There are certainly 

 not two lateral carinae on the third and three on the fourth as 

 in Miss Rathbun 's description. 



The specimens examined are registered as follows: — 



ii^-L Persian Gulf, 26°22' N., 56°i(/ E., 'Investigator.' (i (^ , 18 mm.' 



48-49 fms. I I $ , 15 mm. 



~'-}o^^ Port Blair, Andamans. J. Wood-Mason. i (^ . 14 mm. 



The type and only other known example of the species is re- 

 corded by Henderson from the Gulf of Martaban. 



Aegeon andamanense (Wood-Mason). 



1901. Aegean {Parapoiifocaris) (Uidainiiiieiise. Alcock, Cat. Indian deep- 

 sea Crust. Macriiva and Anomala. p. 121, and lUusf. Zool . ' Investi- 

 gator,' Crust., pi. ix, fig". 2. 



Aegeon bengalense (Wood-Mason). 



1901. Aegean (Parapontocaris) bengalense, .VK'ock, Cat. Indian deep-sea 

 Crust. Macrura ami A)iomala, p. 122, and Illust. Zoal. ' Investi- 

 gator,' Crust., pi. ix, fiq-. I. 



1912. Aegeon {Parapontocaris) ijeuga/ense, Kemp and Scwell, Rec. Ind. 

 Mus., VII, p. 22. 



Genus Prionocrangon, Wood-Mason. 

 Prionocrangon ommatostercs, Wood-Mason. 



1901, Prionocrango)! a»unatosteres, .\lcock. Cat. Indian deep-sea Crust. 

 Macrura and Anoinala, p. 12,^, and lllust. Zool. 'Investigator,' 

 Crust., pi. ix, fig. 4. 



Genus Crangon, Fabricius. 



Crangon crangon (Linnaeus). 



I have compared the Indian specimens with examples from 

 Plymouth and the only appreciable distinctions that I can find are 



' Rathbun, Bull. U.S. Fish Coniin. for 11)03, p. ()ii (1906). 



