80 



Andamans. G. H. Booley. 



Andamans. J- Wood-Mason. 



Ofi Ceylon, 34 fathoms. 



Off Ceylon, 28 fathoms. }-" Investigator." 



I 



Off Malabar coast, 28 fathoms. J 



-r-r-a " P, velutinus " Bate. E. Indian Archipelago. "Challenger" (British Mus.) 



Paeapeneus, S. I. Smith (sensu restricto). 



Sidney I. Smith, Proc. U. S. Nat. Mus. VIII. 1885, p. 170. 

 Type : P. memhranaceus Kiaeo {= P. longirostris Lucas.) 



• Rostrum toothed dorsally only. Antero- inferior angles of carapace usually 

 with, sometimes without, a branchiostegal spine. Post-antennular sulcus defined 

 only ventrally, by the post-antennular (antennal) spine. 



A lojigitudinal suture is generally present on either side extending from the 

 orbital to the posterior border of the carapace, and also a vertical suture extending 

 across the branchiostegite at the level of the 2nd pair of cheHpeds. 



Antennular flagella of moderate length. Bndopodite of maxiUules (1st 

 maxilliB) abbreviated, unsegmented, the small terminal segment which is present 

 in Metapeneus not being differentiated. No exop)odites on any of the thoracic legs. 



Epipodites absent from the 3rd maxillipeds as well as fi'om the last two 

 thoracic appendages. No pleurobranch on the last thoracic somite. 



Andricum symmetrical. 



The 3rd maxillipeds and last pair of thoracic legs are not known to show 

 any modifications in the male. 



The branchial formula is the same as that of Metapeneus, but the rudiment- 

 ary arthrobranch of somite VII (2nd maxillipeds) seems to be absent, and there 

 is no vestigial filament, representing an anterior arthrobranch, on the penulti- 

 mate thoracic somite. 



In addition to the Indian species, I have examined specimens of P. mem- 

 hranaceus and P. serratus. 



Key to the Indian species of the genus Parapeneus. 



I. A fine longitudinal suture, extending from the orbital to the posterior 

 border, on either side of the carapace, and a second transverse suture 

 across the branchiostegite at the level of the 2nd pair of chelipeds : 

 telson with a single pair of marginal spines, which are fixed : — 



