408 Bulletin American Museum of Natural History [Vol. LIII 
Cezlatura putzeysi (Preston) 
Unio (Nodularia) subnigra Preston, 1909, Ann: Mag. Nat. Hist., (8) IV, p. 89, 
Pl. rv, fig. 5. Not Unio subniger I. Lea, 1857. 
Nodularia subnigra Preston. Simpson, 1914, ‘Descript. Cat. of Naiades,’ p 
1042. : 
Unio (Nodularia) putzeyst Preston, 1912, The Nautilus, XX VI, p. 70. 
Lower Belgian Congo (type locality). 
This species appears to be closely related to C . elegans (A. T. de Rochebrune). 
Czlatura randabeli (Bourguignat) — 
Unio randabeli Bourcuignat, 1886, ‘Nouv. Malacol., I, Un. et Irid. Tanganika,’ 
p. 22; 1888, ‘Iconogr. Malacol. Tanganika,’ Pl. xx1, figs. 3 sail & . 
Nodularia (Celatura) randabelt Bourguignat. Senex. 1900, Proc. U. S. Nat. 
Mus., XXII, p. 822; 1914, ‘Descript. Cat. of Naiades,’ p. 1024. 
Lake Tanganyika: western shore, north of the Lukuga River (type locality). 
Celatura sordida (A. T. de Rochebrune) 
Zairia sordida A. T. p—E RocHEBRUNE, 1886, Bull. Soc. Malacol. France, III, p. 
12. Simpson, 1900, Proc. U. 8. Nat. Mus. , XXIT, p. 862. 
_ Nodularia sordida A. T. de i le eam, Simpson, 1914, ‘Descript. Cat. of 
Naiades,’ p. 1045. 
Gancini or Nganchu, on the right bank of the Congo River (type locality; 
Thollon Coll.). , 
PSEUDAVICULA Simpson ~ 
Pseudavicula SIMPSON, 1900, Proc. U.S. Nat. Mus., XXII, p. 860. Monotype: 
Unio johnstoni E. A. Smith. 
Shell with a well-developed anterior and posterior dorsal wing; dorsal line 
strongly incurved; beaks full, not high; a high, down-curved posterior ridge runs to 
the posterior basal point, and between this point and the posterior point of the wing 
the outline is deeply incurved; base and lower part of anterior end rounded; surface 
slightly sculptured with concentric ridges; beak sculpture not known. Anterior tooth 
of left valve elongate, slightly corrugated, that of the right double; laterals in left 
double, single in the right, straight, elongated, thin, and prominent. Animal unknown 
(after Simpson, 1914, ‘Descript. Cat. of Naiades,’ p. 1190). 
Only one species is known. 
Pseudavicula johnstoni (Ei. A. Smith) 
Text Figure 90 
Unio (Metaptera) johnstont EK. A. Smrru, 1893, Proc. Zool. Soc. London, p. 640, 
Pl. urx, figs. 18-20. E. v. Marrens, 1897, “Deutsch Ost Afr., IV, Beschalte Weichth..,’ 
p. 240. 
Pseudavicula Nalisiois K. A. Smith. Simpson, 1900, Proc. U. 8. Nat. Mus., 
XXII, p. 861; 1914, ‘Descript. Cat. of Naiades,’ p. 1190. Grrmarn, 1909, Arch. 
Zool. Exp. Sen , XLI, p. 127, fig. 57. 
Lake Ailoeto: originally described from that lake without more definite locality 
(R. Crawshay Coll.). 
