406 Bulletin American Museum of Natural History (Vol. LIIT 
Length, 46.5 mm.; height, 37.0 mm.; diameter, 20.5 mm. Type. 
‘45.0 ie BAS A 20.0 Paratype. 
This fine mussel stands close to Unio essoensis Chaper, of Assinie, 
but it differs by the decidedly narrower anterior end. U. nguigmiensis 
Germain and U. jeanneli Germain (= U. jourdyt Germain) resemble it in 
outline; they have coarsely tubercular beaks like C. xgyptiaca. C. 
stagnorum appears related to this species by the shape and texture, and 
until the beaks are known we refer rotula to Levirostris. 
Other Species of Celatura Recorded from the Belgian Congo 
Celatura xgyptiaca (Cailliaud) 
Text Figure 89 
Unio xegyptiacus CAILLIAUD, 1827, ‘Voyage 4 Méroé,’ IV, p. 263; 1823, Atlas, 
II, Pl. uxt, figs. 6-7 (type locality: Joseph’s Canal, Lower Egypt). H. Apams, 1886, 
Proc. Zool. Soc. London, p. 376. EH. A. Smrru, 1888, op. cit., p. 56. J. THreE, 1911, 
‘Wiss. Ergebn. D. Z. Afr. Exp. (1907-08),’ III, p. 212. 
Margarita (Unio) egyptiacus Cailliaud. I. Lea, 1838, ‘Synopsis of Naiades,’ 24 
Ed., p. 21. 
Fig. 89. Celatura xgyptiaca (Cailliaud). Nile. 
Nodularia (Celatura) egyptiaca Cailliiaud. Simpson, 1900, Proc. U. 8. Nat. Mus.,. 
XXII, p..821; 1914, ‘Descript. Cat. of Naiades,’ p. 1019. 
Unio pumilus “Ziegler” JickELI, 1874, Nova Acta Ac. Nat. Cur. Dresden, 
XXXVII, 1, p. 272 (as a synonym of U. xgyptiacus). 
Celatura egyptiaca Cailliaud. C. R. Barrer anp F. Haas, 1915, Zool. Jahrb., 
Abt. Syst., XX XVIII, p. 382, Pl. xxv1, figs. 7a-f. 
Lake Albert: recorded without more definite locality from that lake (S. Baker 
Coll.) by H. Adams and E. A. Smith; Kassenje (Schubotz Coll.). 
A. T. de Rochebrune has listed this species from Mokaka, French Congo. We 
have seen no specimens from within our limits. 
As this species is the type of the genus Czlatura we are figuring a specimen from 
the Nile to show the typical beak sculpture (Fig. 89). 
_ According to Germain (1922, ‘ Voy. Zool. Gadeau de Kerville Syrie, Moll. T Fl : 
and others, Unio eucyphus Bourguignat (1857, Rev. Mag. Zool., LX, p. 19, Eh IIT, fics. tay apo eiedt. 
noe Scamander River, Anatolia, is a synonym of Celutura zgyptliaca and came most probably from. 
