280 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxii. 



SESARMA (HOLOMETOPUS) ELEGANS Herklots. 



Sesanna elegans Herklots, Addit. Fauna Afr. Ooc, 1851, p. 10, pi. i, fig. 10.— de 

 Man, Notes Leyden Mus., I, 1879, p. 69. 



West African localities. — ISTear Boutry, G-uinea (Herklots); Ogove 

 (Thallwitz). 



Subgenus PARASESAEMA de Man. 



KKY TO THE "WEST AFRICAN SPECIES OF THE SUBGENUS PARASESARMA. 



A. Outer surface of hand perfectly fiat and smooth Mittikoferi. 



A'. Outer surface of hand not perfectly flat and smooth angolensis. 



SESARMA (PARASESARMA) BUTTIKOFERI de Man. 



Sesarma hilttikoferi de Man, Notes Leydeu Mus., V, 1883, p. 163. 



West African localities. — Rock Spring, Monrovia (O. F. Cook, 

 collector); Fisherman Lake, Liberia (de Man); Grunk River, Liberia 

 (U.S.N.M.); Bibundi, Kameruii, in brackish water at the mouth of 

 the river Bekongolo ( Aurivillius) ; river i^'Dian, Kamerun, brackish 

 water (Aurivillius); Ogove (Thallwitz). 



SESARMA (PARASESARMA) ANGOLENSIS Capello. 



Sesarma angolensis Capello, Desc. tres esp. nov. Crust. Afr. Occ, Lisboa, 1864, 

 p. 4, fig. 2; Mem. Acad. R. Sci. Lisboa, CI. Sci. Nat., Nova Ser., 11, 1865, Pt. 2. 



West African localities. — Grand Cape Mount, Liberia (de Man); 

 Kamerun, at Bibundi on land, and river IST'Dian, brackish water (Auri- 

 villius); Ponte da Leuha, Kongo (Studer); Sea of Angola (Capello); 

 Angola (Osorio). 



Subgenus PERISESARMA de Man. 



KEY TO THE WEST AFRICAN SPECIES OF THE SUBGENUS PERISESARMA. 



A. External surface of palm rising to an acute tubercle, situated near the external 



inferior angle Tcamermani. 



A'. External surface of palm regularly convexly arched africanum. 



SESARMA (PERISESARMA) KAMERMANI de Man. 

 Sesarma kamermani de Man, Notes Leyden Mus., V, 1883, \i. 165. 

 West African locality. — Muserra, Kongo (de Man). 



SESARMA (PERISESARMA) AFRICANUM Milne-Edwards. 



Sesarma africana Milne Edwards, Hist. Nat. Crust., II, 1837, p. 73; Ann. Sci. Nat. 



(3), XX, 1853, p. 185 [151]. 



Range. — Barbados (Paris Mus.); West Africa. 



West African localities. — Senegal (Milne-Edwards); Rock Spring, 

 Monrovia (O. F. Cook, collector); Liberia (de Man); Beyah River, 

 Ashautee (Benedict); near Boutry, Guinea (Herklots); Ekundu and 

 Bibundi, Kamerun (Aurivillius); Gabun (Paris Mus.); Ogove (Thall 

 witz) ; Benguella (Osorio). 



