378 Bulletin American Museum of Natural History [Vol. LIII 
has placed them in a section Cafferia. The conchological criteria of these 
several groups are at present obscure; and, since the soft parts are known 
for very few of the African species,' it seems unwise to attempt at 
present a generic classification of the many forms described from the 
Ethiopian Region. We have therefore listed the species in alphabetical 
sequence, the reference to Simpson’s ‘ Descriptive Catalogue’ indicating 
in each case where the species has been tentatively located. An exception 
has been made for the many names proposed for Grandidieria, which 
will be found on pp. 394-399. 
The following species, which have been sometimes listed as African, do not belong 
to the Ethiopian fauna: Unio divaricatus I. Lea, U. navigioliformis I. Lea, U. rec- 
tilinearis Sowerby, and U. sitifensis Morelet.? 
Unio abyssinicus E. v. Martens, 1866, Malakoz. Blatter, XIII, p. 102; 1867, 
op. cit., XIV, p.17. JickE i, 1874, Nova Acta Ac. Nat. Cur. Dresden, XX XVII, 1, p. 
278, Pl. rx, figs. 5a-c. Simpson, 1914, ‘Descript. Cat. of Naiades,’ p. 582 = Unio 
habessinicus HnuGtin, 1868, ‘Reise nach Abessinien,’ p. 290. Lake Tsana, Abyssinia. 
Placed by Simpson in Cafferia. 
Parreysia acuminata (H. Adams). See p. 308. 
Celatura xgyptiaca (Cailliaud). See p. 406. 
Celatura xgyptiaca var. shambiensis (Longstaff) = Nodularia xgyptiaca var. 
shambiensis LonastaFr, 1914, Journ. Linn. Soc. London, Zool., XXXII, p. 253, PI. 
xvill, figs. 4-7. Lake Shambe, Nile. 
Unio eneus JIcKELI, 1874, Nova Acta Ac. Nat. Cur. Dresden, XX XVII, 1, p. 
274, Pl. 1x, fig. 2. Lake Tsana [Dembea], Abyssinia. 
Cexlatura equatoria (Morelet). See p. 401. 
Unio aferula I. Lea, 1864, Proc. Ac. Nat. Sci. Philadelphia, XVI, p. 109; 1866, 
‘Observ. Unio,’ XI, p. 38, Pl. x11, fig. 834 = Parreysia aferula Stupson, 1914, ‘Descript. 
Cat. of Naiades,’ p. 11384. Lake Nyasa. 
Unio africanus I. Lea, 1856, Proc. Ac. Nat. Sci. Philadelphia, VIII, p . 94; 1857, 
‘Observ. Unio,’ VI, p. 20, Pl. xxvii, fig. 15=Unio (Cafferia) caffer var. africanus 
Simpson, 1914, ‘Descript. Cat. of Naiades,’ p. 576. Cape of Good Hope. 
Unio alfierianus BourRGuIGNAT, 1885, ‘Moll. Choa,’ p. 48. Guebe River, affluent 
of the Oromo River, taking its source in the Ennerea Mts., Abyssinia. 
Unio (Parreyssia) alluaudi DautzenBurG, 1808, Journ. de Conchyl., LVI, p. 
26, Pl. 11, figs. 13-16 = Parreyssia alluaudi Stmpson, 1914, ‘Descript. Cat. of Naiades,’ 
p. 1141. Kavirondo Bay, Lake Victoria. 
Unio ambifarius E. v. Martens, 1897, ‘Deutsch Ost Afr., IV, Beschalte 
Weichth.,’ p. 225, Pl. vu, fig. 20=Nodularia (Czlatura) ambifaria Stupson, 1914, 
‘Descript. Cat. of Naiades,’ p. 1036. Daressalaam, Tanganyika Territory. 
; Unio angoniensis Preston, 1910, Ann. Mag. Nat. Hist., (8) VI, p. 59, PI. IV, 
fig. 5. Simpson, 1914, ‘Descript. Cat. of Naiades,’ p. 725. Angoniland, to the 
south of Lake Nyasa. According to Dupuis [1923, Ann. Soc. Zool. Belgique, LITI, 
(1922), p. 82] this is exceedingly close to U.. borellii Ancey. Placed doubtfully in 
Unio by Simpson. 
1So0 far as we are able to discover they have only been examined in Unio caffer (see p. 387) and in 
mee ie ee le (see p. 400) 
*Many additional names have been recently listed by Pallary, from E t (1924, Mé : 
d’Egypt, VII, 1, pp. 44-51). if ij sos ae 
