12 



/ 



Lateral margins of carapace parallel, except immediately 

 behind external orbital angle 7 



7. Infra-orbital ridge in (f regularly crenulate 8 



Infra-orbital ridge in cf subdivided into three elongate 



lobules ; the lateral one the longest C. parvtdus de Man 



8. Two obscure notches (sometimes only one) behind each 



external orbital angle C. intermedius Ortmann ^) 



Lateral margins of carapace entire C. Jieiishaivi Rathbun -) 



I . Cyclograpsiis parvulus de Man. 



1896. Cyclograpsus parvulus de Man. Zool. Jahrb., Syst., Bd 9, p. 350, Bd 10, 1898, pi. 32, f. 42. 

 1907. Cyclograpsus parvulus Rathbun. Mem. Mus. comp. Zool. Harvard Coll., v. 35, n" 2, p. 36. 



Stat. 64. Tanah Djampeah, Flores Sea. i 9- 



This specimen agrees nearly completely with those of de Man, but the inner part of the 

 infra-orbital ridge in my 9 is not entire, but consists of 5 small lobules, and the lateral portion 

 is likewise subdivided into 3 — 4 lobules, as de Man rightly remarked in the case of the 9- The 

 original specimens came from Atjeh ; afterwards the species has been collected at the Paumotus. 



NoBiLi has described a subspecies [tmidens) ■') in which one epibranchial tooth is found 

 behind the external orbital angle and the posterior margin of the penultimate segment of the 

 abdomen of the cT is not straight, but concave forward. 



I retained the name of parvulus for this species, but de Man himself observed 

 afterwards *), that his species should be considered at most a subspecies of the Atlantic 

 C. occidcntalis A. Milne-Edwards. 



Subfam. Pl.agusiinae. 



There are two well known genera belonging to this group : Plagtisia and Perciion 

 (= Leiolop/ms), which are at once characterized by the stout antennulae being lodged in oblique 

 fossae of the front and visible in dorsal view. The middle segments of the abdomen are largely 

 coalesced in both sexes, the carpus of the external maxillipeds articulates near the antero- 

 external angle of the merus, and the lateral margins of the carapace are toothed. 



The two genera are at once distinguished by the following characters : 

 Carapace thick. Merus of external maxillipeds as broad as ischium . . . Plagtisia Latreille 

 Carapace much flattened. Merus of external maxillipeds much smaller and 



narrower than ischium Percnon Gistel 



1) Zool. Jahib., Syst., Ed 7, 1894, p. 728. Hab. Indian Ocean, Loo-Choo Islands and Japan. Peiliaps C.iiikrmcJins is synonymous 

 to C. longipcs. 



2) Troc. U.S. Nat. Mus., v. 26, 1902, p. 75, texlfig. 1—2; Bull. U.S. Fish Comra. for 1903, v. 23, pit 3, 1906, p. 840. Hab. 

 Hawaiian Islands. 



3) Ann. Mus. Hung., v. 3, 1905, p. 501. Hab. Berlinharbour, German New Guinea. 



4) Mem. Soc. Zool. France, 1900, p. 57. 



127 



