CRUSTACEA. 



503 



cannot be given ; but it is somewhat smaller t ban adult P. tridaence, 

 Tbe chelipede of the second pair measures about 7 lines (15 millim.). 



Two specimens, of which one is an adult femalo with ova, wore 

 obtained at the Seychelles (12 fms.), where they inhabited " clamp 

 shells" (bivalves?). 



They arc distinguished from all the species with which I am 

 acquainted, except P. vmd&ns, Eingsley, by the extremely short 

 rostrum, which is not laterally compressed, and from all by the form 

 of the chelipcdes of the second pair. From the species of Corallio- 

 caris, Stm. (CEdipus, Dana), they are distinguished, among other 

 characters, by the form of the dactyli of the ambulatory legs. 



In P. unidens, Kingsley, from Florida*, not only is the form of 

 the chelipedes different, but also the antenna! scale is shorter, reach- 

 ing only to the end of the last joint of the peduuclc. 



6. Coralliocaris graminea (Dana). 



Four specimens, of which two are adult females with ova, were 

 obtained at the Seychelles, 4-12 fms. (No. 194). Specimens from 

 the samo locality were presented to the Museum by Dr. E. 1'. 

 Wright. 



These specimens agree with the description of Dana in all par- 

 ticulars except that no trace remains of the characteristic markings 

 of the carapace, the coloration in spirit being yellowish ; and the 

 margins of the rostrum above the eyes are slightly convexly ar- 

 cuated ; the tooth on the inferior margin of the rostrum, or one of 

 the teeth of the superior margin, is occasionally absent. 



Dana's specimens were from the Fijis. Dr. Stimpson records 

 this species from Hong Kong. 



Coralliocaris nndirostris (Heller), from the Red Sea, may possibly 

 be identical with this species ; but in the figure the dactyli of the 

 chelipedes are of very different form (ef. Heller in Sitz. Wien. 

 Akad. xliv. (1) p. 279, pi. iii. fig. 25, 1862). 



7. Penteus canaliculars, Olivier. 



A small specimen, I think a male, was obtained at Poivre Island, 

 on the beach (No. 198). 



Since reference was made to this species in my memoir on the 



jl genus, in 1878 1, specimens have been added to the collection from 



" Richmond Paver, N. S. "Wales (A. P. Goodwin) ; there is also in the 



i Museum collection a small example, in bad condition, from Swan 



River (Bring). 



Penceus brevirostris, EingsleyJ, is very nearly allied to, and may 

 ■ be identical with, this species, but it has two teeth on the inferior 



* Proc. Acad. Nat. Sci. Philad. p. 422, pi. xiv. fig. 9 (1879). 



t Proc. Zool. Soc. p. 298 (1878). 



t Proc. Acad. Nat. Sci. Philad. p. 98 (1878). 



2o2 



