i6 Records oj the Indian Museum. [Voi,. VII, 



Only a few of the more important papers dealing with deep- 

 sea Decapoda are cited. The date appended to an author's name 

 affords reference to the short bibliography at the end of the 

 paper. 



DECAPODA NATANTIA. 



Tribe Penaeidea. 



Family PENAEIDAE. 



Sub-family PENEINAK. 



Pcneopsis coniger var. andamanensis (Wood-Mason). 



Metapeneiis coniger var. andamanensis, Alcock, 1901, p. 17, and 



1906, p. 27, pi. iv, fig. 13. 

 Pcneopsis coniger var. andamanensis, deMan, 191 1, p. 61. 



Eleven males and nineteen females were obtained at St. 389. 



The distinctions between the variety and the typical form which 

 are afforded by the thelycum are well marked and apparently 

 constant. The form found in the variety has been illustrated by 

 Alcock and we take this opportunity of giving a similar figure 

 of the thel3^cum of the typical P. coniger (pi. i, fig. 7). 



In males we have been unable to detect the pair of spines 

 which de Man mentions at the base of the second peraeopods. 



Parapencus rectacutus (Bate). 



Peneus {Parapencus) rectacutus, Alcock, 1901, p. 17, and ///. Zool. 



Invest., Crust., pi. xlix, fig. 5. 

 Parapencus rectacutus, Alcock, 1906, p, ^^, pi. vi, figs. 19, iga-b, 



and de Man, 1911, pp. 78, 82. 



A much damaged female from St. 391 may safely be referred 

 to this species. The station represents the most westerly point 

 at which P. rectacutus has been observed. 



With reference to de Man's notes on this species {loc. cit., 

 p. 82) we would observe that the minute rudiments of exopods 

 on the thoracic legs, mentioned by Wood-Mason and Alcock (1891, 

 p. 274), can be detected in examples preserved in the Indian 

 Museum. The ridge defining the anterior part of the cervical 

 groove agrees precisely with Alcock 's figure, but in some females 

 the spine which is stated to occur on the basis of the second 

 peraeopods appears to be missing. The last pair of legs fails to 

 reach to, or slightly exceeds, the apex of the antennal scale. 

 There is no sharp spine at the distal end of the lobes of the 

 petasma. 



Haliporus aequalis, Bate. 



Haliporus aequalis, Alcock, 1901, p. 23, and de Man, 1911, p. 32. 

 Seven males and fourteen females were obtained at vSt. 391. 



