ifo.ll9&. CRUSTACEANS OF WEST AFRICA— BATHBUIS. 285 



PARATHELPHUSA BRAZZiE A. Milne-Edwards. 



Paratlielpliusa hrazzce A. Milne-Edwards, Bull. Soc. Philom. (7), X, 1886, p. 148; 



Anu. Sci. Nat., Zool. (7), IV, 1887, p. 142, fig. 6. 

 Potamon (Acanthothelphusa) hrazzce Ortmann, Zool. Jahrb., Syst., X, 1897, p. 300. 



West African locality. — Ngancin, Kongo (A. Milne-Edwards). 

 PARATHELPHUSA CHAPERI A. Milne-Edwards. 



Paraihelphusa chaperi A. Milxe-Edwards, Ann. Sci. Nat., Zool. (7), IV, 1887, 

 p. 144, fig. 4. 



West African locality. — Assini (A. Milne-Edwards). 



PARATHELPHUSA P.<ECILEI A.Milne-Edwards. 



Thelphusa pcvcUei A. Milne-Edwards, Bull. Soc. Philom. (7), X, 1886, p. 149. 

 Parathelphusa pcecilei A. Milne-Edwards, Ann. Sci. Nat., Zool. (7), IV, 1887, 



p. 143, fig. 1. 

 Potamon (Acanthothelphusa) pcecilei Ortmann, Zool. Jahrb., Syst., X, 1897, p. 300. 



West African locality. — Alima River, Bateke, French Kongo (A. 

 Milne-Edwards). 



PARATHELPHUSA CAMPI Rathbun. 



Parathelphusa campi Rathbun, Proc. U. S. Nat. Mus., XVII, 1894, p. 25. 

 Potamon (Acanthothelphusa) campi Ortmann, Zool. Jahrb., Syst., X, 1897, p. 300. 



West African locality. — Stanley Pool, Kongo. 



. PARATHELPHUSA CHAVANESI A. Milne-Edwards. 



Thelphusa chavanesi A. Milne-Edwards, Bull. Soc. Philoin. (7), X, 1886, p. 150. 

 Parathelphusa chavanesi A. Milne-Edwards, Ann. Sci. Nat., Zool, (7), IV, 1887, 



p. 145, fig. 3. 

 Potamon (Potamonautes) chavanesi Ortmann, Zool. Jahrb., Syst., X, 1897, p. 309. 



West African locality. — Environs of Eranceville on the Alima, French 

 Kongo (A. Milne-Edwards). 



Genus ERIMETOPUS Rathbun. 



ERIMETOPUS SPINOSUS Rathbun. 



Erimetopus spinosus Eathbun, Proc. U. S. Nat. Mus., XVII, 1894, p. 26. 



West African locality. — Stanley Pool, Kongo; under boards and tim- 

 bers, in mud. 



Family PILUMNID^. 



key to the west AFRICAN GENERA OF THE FAMILY PILUMNID^. 



A. The ridges that define the efferent branchial channels, if present, are low and 

 are confined to the posterior part of the endostome, never reach- 

 ing to the anterior boundary of the buccal cavern. 

 B. Fronto-orbital border hardly ever (in adults) more than half, most usually 

 much less than half, the greatest width of the carapace, 

 C, Antero-lateral margin continued to the angle of the buccal cavity; carapace 

 eroded Glyptoxan thus 



