314 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxii. 



Etome, Kamerun, iu brooks ^Aurivillius); Rio Papagaio, Princes Is- 

 land (Osorio); St. Thomas Island (Greeff, Osorio); Rolas (Greeff); 

 Gabun (Giebel); Duqne de BraganQa (Osorio). Known in Africa as 

 *'Siitu-feelee" or "Bitter crayfish." 



Genus CARIDINA Milne-Edwards. 

 CARIDINA TOGOENSIS Hilgendorf. 



Caridina iogoensts Hilgendorf, SB. Ges. Naturf. Fr., Berlin, 1893, p. 156. 



Wesi African localities. — Bismarckburg and Adeli, Togoland (Hilgen- 

 dorf). 



Family PAL^EMOXID^. 



KEY TO THE WEST AFRICAN GENERA OF THE FAMILY PALyEMONlDiE. 



A. Mandibles with a palpus. 



B. Frontal margin of carapace ■u-ith one tooth on each side; a second on the 



hepatic region nearly iu the same horizontal line Bithynis. 



B'. Frontal margin of carapace with two antenna! teeth, one above the other. 



Palcemon. 

 A'. Mandibles without a palpus Palcemonetes. 



Genus PAL^^MON Fabricius. 



KEY TO THE WEST AFRICAN SPECIES OF THE GENUS PALiEMON. 



A. Rostrum with seven teeth above and three below maculattis. 



A'. Rostrum with eight teeth above and four or five below. 



B. Fingers of second pair of feet much longer than palm; carpus much shorter 



than merus hastatus. 



B'. Fingers of second pair of feet much shorter than palm; carpus longer than 

 merus edivardsii. 



PAL.EMON EDWARDSII Heller. 



Palcemon longirostria Milne-Edwards, Hist. Nat. Crust., II, 1837, p. 392; not P. 



longirostris Say, nor P. longirostris Milne-Edwards, Hist. Nat. Crust., II, 1837, 



p. 394. 

 Palcemon edivardsii Heller, Crust, siidl. Europa, 1863, p. 265. — Carus, Fauna 



Medit., I, 1885, p. 473. 

 Leander edivardsii Ortmann, Zool. Jahrb., Syst., V, 1891, p. 515. 



Range. — Bay of Biscay; Mediterranean; West Africa. 



West African localities. — Monrovia and Mount Coffee, Liberia (O. F. 

 Cook and G. M. Collins, collectors). The African specimens are appar- 

 ently the same species that exists in the Mediterranean and the Bay of 

 Biscay. I have, however, no specimens for comparison. 



