In addition to my description of Palaemon (Eupalaemon) Lenzii de Man (see p. 225 of this volume) I give here a key to the species of the subgenus Eupalaemon Ortm. as yet known to occur in the rivers of West-Africa. Six species are at present known from there, viz.: 1. Pal. (Eupalaemon) macrobrachion Herklots 1851. General distribution: The rivers from Sierra Leone to Benguella [Sierra Leone (v. Martens); Liberia (de Man); near Boutry (Herklots); river Prah, South of Ashantee (de Man); Cameroon (Aurivillius); Congo coast, probably from Ambriz (de Man); from fresh water at Catumbella near Benguella (de Man)].