203 



stalks being mobile, not fixed, and the antero-external angle of the merus of the external 

 maxillipeds not produced at all ; both these species came from Amboyna. C. villosa certainly 

 belongs to the Rhizopinae, although I am unable to indicate its proper systematic place; C. 

 leptochelis, hovvever, is quite another species, and its whole habitus points to Panopeiis or rather 

 to Mei ia. 



Key to the species : 



1. Carapace nude and hairless (at least in its central parts). Walking 



legs scantily fringed 2 



Carapace tomentose 6 



2. Postero-lateral margins of carapace subparallel. Ratio of length 



of carapace to greatest breadth as i : 1.3 3 



Postero-lateral margins of carapace convergent backward. . . 4 



3. (Juter surface of palm smooth and polished, except for a few 



depressed granules inferiorly C. ciliata Stimpson 



Outer surface of palm of cheliped with 4 — 5 longitudinal rows 

 of granules. Back of movable finger with a group of granules 

 at the base C. pu7iciata Baker ^) 



4. Ratio of length of carapace to greatest breadth as i : 1.3. Mero- 



podite of cheliped with a subdistal tooth, carpopodite angulate 

 at inner angle. Dactyli of last pair of legs apparently not 



curved backward C. laevis Miers ") 



Ratio of length of carapace to greatest breadth as i : 1.6. Dactyli 

 of last pair of legs curved backward 5 



5. Fronto-orbital bfeadth more than one-half of greatest breadth of 



carapace, front faintly bilobed, greatest width of carapace situated 



anteriorly. Lateral angles of third abdominal segment of cT acute C. fjilgida Rathbun ^) 

 Fronto-orbital breadth equal to, or less than, one-half of greatest 

 breadth of carapace, front perfectly straight at anterior margin, 

 greatest width of carapace situated further backward than in 

 preceding species. Lateral angles of third abdominal segment 

 of cf rectangular C. triincatifrons Rathbun 



6. Antero-lateral margins of carapace passing angularly into postero- 



lateral ones. Outer surface of palm smooth C. arcuata Miers *) 



Outer surface of palm with large granules 7 



7. Eyes unpigmented C. hispida Alcock °) 



1) Transact. Roy. Soc. South Australia, v. 31, p. 176, pi. 23, f. 2. Hab. unknown. 



2) Zool. H. M. S. "Alert", Ciust., 1S84, p. 244, pi. 25, f. C. Hab. Arafura Sea, 32 — -36 fathoms. Probably identical with Notonyx 

 iiitidtts A. Milne-Edwards. 



3) Proc. U.S. Nat. Mus., v. 48, 1914, p. 146. Hab. Philippines, 83 fathoms. 



4) Zool. H. M. S. "Alert", Crust., 1884, p. 243, pi. 25, f. B. Hab. Port Darwin, 12 fathoms. 



5) Journ. As. Soc. Bengal, v. 69, prt 2, igoo, p. 321; 111. Zool. "Investigator", Crust., prt 10, pi. 61, f. 4; Rathbun, K. Dansk 

 Vid. Selsk. Skr., 7. Raekke, Afd. 5, n» 4, 1910, p. 342. Hab. Palk Strait and Gulf of Siam, in depths of a few fathoms. 



55 



