428 Bulletin American Museum of Natural History [Vol. LIII 
Spatha I. Lea, 1838, Trans. American Phil. Soc., N.S., VI, pp. 118 and 141. On 
p. 118 monotypic for Iridina nilotica Cailliaud. 
Calliscapha Swainson, 1840, ‘Treatise on Malacology,’ p. 380. Monotype: 
Tridina nilotica Cailliaud. 
Mutelina Bourguienat, 1885, ‘Esp. Nouv. Ouk. Tanganika,’ p. 11. Monotype 
(on p. 12): Mutela subdiaphana Bourguignat. 
Mutela subgenus Pseudomutela Stupson, 1900, Proc. U. S. Nat. Mus., XXII, p. 
905. Monotype: Mycetopus plicatus Sowerby. 
Mutelinze with the shell oblong to subtriangular, smoothish (except for a carina 
on the posterior ridge in the subgenus Chelidonopsis). The hinge is either smooth and 
narrow or set with many short similar teeth (taxodont), the sinulus of its posterior 
end shallow, rounded or inconspicuous. The scar of the pedal protractor muscle is 
small, short. Mantle margins are broadly concrescent for one-fourth to half of their 
ventral length between branchial and pedal orifices. 
This genus is exclusively African and has the same distribution as 
Aspatharia. 
Subgenus MuTELA, proper 
The following species have been described: 
Mutela xgyptiaca (Pallary) =Mutelina xgyptiaca Patuary, 1924, Mém. Inst. 
d’Egypte, VII, 1, p. 52, Pl. rv, figs. 14 (type), 18 (var. obtusa Pallary, p. 53), and 15 
(var. rhynchota “‘ Bourguignat”’ Pallary, p. 53). Mahmudieh Canal, Lower Egypt. 
Mutela alata (I. Lea) Simpson, 1914, ‘ Descript. Cat. of Naiades ’ép. 1356 =Spatha 
alata I. Lea, 1864, Proc. Ac. Nat. Sci. Philadelphia, XVI, p. 109; 1867, ‘Observ. 
Unio,’ XI, p. 39, Pl. x11, figs. 31. Lake Nyasa. 
Mutela alluaudi Germain. See p. 435. 
Mutela angustata (Sowerby). See p. 485. 
Mutela angustata var. curta GERMAIN, 1906, Bull. Mus. Hist. Nat. Paris, p. 174, 
fig. 6. Mutela dubia var. curta Simpson, 1914, ‘Descript. Cat. of Naiades,’ p. 1354. 
Lake Chad. 
| Mutela angustata var. ponderosa GERMAIN, 1906,Bull. Mus. Hist. Nat. Paris, 
p. 56, fig. 1. Mutela dubia var. ponderosa Simpson, 1914, ‘Descript. Cat. of Naiades,’ 
p. 1854. Lake Chad. 
Mutela bourguignati “ Ancey’’ BourGuIGNAT, 1885, ‘Esp. Nouv. Ouk. Tanganika,’ 
p. 8. Simpson, 1914, ‘Descript. Cat. of Naiades,’ p. 1358. Near the mouth of the 
Chimau River in Lake Victoria. 
Mutela bourguignati var. smitht E. v. Martens, 1897, ‘Deutsch Ost Afr., IV, 
Beschalte Weichth.,’ p. 255. Simpson, 1914, ‘Descript. Cat. of Naiades,’ p. 1358 = 
Mutela bourguignati E. A. Smiru, 1892, Ann. Mag. Nat. Hist., (6) X, p. 128, Pl. 
XII, fig. 16 (not of Bourguignat). Lake Victoria. 
Mutela bourguignati var. truncata E. v. Martens, 1897, ‘Deutsch Ost Afr., 
IV, Beschalte Weichth.,’ p. 255, Pl. vii, fig. 17. Simpson, 1914, ‘Descript. Cat. of 
Naiades,’ p. 13858. Lake Victoria. 
Mutela chevalieri Germain. See p. 4385. 
Mutela complanata (Jousseaume) = Mutelina complanata JoussEAUME, 1886, 
Bull. Soc. Zool. France, XI, p. 489, Pl. x11, figs. 1-la. Spatha complanata SIMPSON, 
1914, ‘Descript. Cat. of Naiades,’ p. 1343. Fuladugu, Niger River. 
