1916. | S. Kemp: Notes on Crustacea Decapoda. 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 ortentalts ', 
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 obliquely 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 :— 
4474+ Persian Gulf, 26°22’ N., 56°10’ E., ‘Investigator.’ Ig, 18 mm. 
48-49 fms. ¥ OTS mnt: 
2430 Port Blair, Andamans. J. Wood-Mason. 1, 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. Aegeon (Parapontocarts) andamanense, Alcock, Cat. Indian deep- 
sea Crust. Macrura and Anomala, p. 121, and /llust. Zool. ‘ Investi- 
gator,’ Crust., pl. ix, fig. 2. 
Aegeon bengalense (Wood-Mason). 
1901. Aegeon (Parapontocarts) bengalense, Alcock, Cat. Indian deep-sea 
Crust. Macrura and Anomata, p. 122, and Illust. Zool. ‘ Investt- 
gator, Crust., pl. ix, fig. 1. 
1912. Aegeon (Parapontocaris) bengalense, Kemp and Sewell, Rec. Ind. 
Mas. NAW, p. 22. 
Genus Prionocrangon, Wood-Mason. 
Prionocrangon ommatosteres, Wood-Mason. 
1901, Prionocrangon ommatosteres, Alcock, Cat. Indian deep-sea Crust. 
Macrura and Anomala, p. 123, and Jllust. Zool. ‘ Investigator, 
Crust., pl. 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 

1 Rathbun, Bull. U.S. Fish Comm. for 1903, p. 911 (1906). 
