1880.] NATURAL SCIENCES OF PHTLADELPHIA. 213 



S. indicum Kingsley ex A. Milne-Edwards. 



Mctagra'psus indicus A. M.-Edw., Nouv. Arch, dii Mus., iv, p. 174, 



XXVI, f. 1-5 (1868). 



Celebes (A. M.-Edw.). 



S, integrum Kingsley ex A. Milne- Edwards. 



Metagrapsiis integer A. M.-Edw., Nouv. Arch, du Mus., ix, p. 309, 



PL XVII, f. 3 (1873). 



New Caledonia (A. M.-Edw.). 



Genus RHACONOTTJS Gtrstsecker, 1866. 



Carapax sub-quadrate, sides areuate, toothed. Front narrow, 

 about one-third the width of the carapax. Mei'os of external 

 maxillipeds nearly- as broad as long and about half the length of 

 the ischium. Ambulatory feet compressed, the margins of the 

 joints serrate. 



B. crenulatus Gerstrecker. 



Rhaconotus crenulatus Gerstsecker, Arcliiv fiir Naturgeschicbte, xxi, 



p. 142 (1856). 



Locality unknown. 



Genus SESARMA Say, 1818. (Pachysoma De Haan, 1835. Holometopus Edw., 1853.). 



Carapax thick, quadrate, lateral margins straight, entire or 

 toothed. External maxillipeds with an oblique piliferous ridge 

 crossing the ischium and meros ; the meros elongate, its apex 

 rounded. Antenna? entering the orbit. 



I have not attempted to revise the species of this genus on 

 account of a lack of sufficient material. I merely give a list of 

 the described' species, indicating in a few cases the synonymy, 

 but leaving the task of comparing a large number of poor descrip- 

 tions to some future carcinologist. 



S. aflBnis Edw. (= ? quadrata). 



Orapsus (Pachysoma) affinis De Haan, op. cit., p. 61, PI. XVIII, f. 



5 (1835). 

 Sesarma affinis Edwards, Ann. Sci. Nat., Ill, xx, p. 183 (1853). 



Japan (De Haan) ; China (Edw.) ; Natal (Krauss). 

 S. africana Edwards. 



Sesarma africana Edw., Hist. Nat. Crust., ii, p. 73 (1837). 



Senegal (Edw.). 

 S. americana Saussure. 



Sesarma americana Saixssure, Mem. Soc. Phys. et Hist. Nat., xiv, p. 

 441 (1858). 



St. Thomas, W, I. (Saussure). 

 S. angolensis Capello. 



Sesarma angolensis Capello, Descr. tres sp. Nov. Crust, du Africa Oc- 

 cident, p. 4, f. 2 (1864). 



Angola, West Africa (Capello). 



