SPATHA 1333 



species. Jickeli, indeed, says "cardo Iciitcr callosns, cdentulus. 

 Fades interns pallide rosea . . .," which applies well to a 

 Spatha. Our species, on the contrary, has a filiform hinge 

 and the interior of the valves is a grayish-blue, two charac- 

 ters, which belong only to the genus Spathella. Besides being 

 smaller, the S. fourtaui differs also by its more slender form 

 and slightly more angulated posterior margin." (Pallary). 



No dimensions given. Length of figure 62.5, height 29.5 

 mm. 



Type locality. Upper Nile. 

 Spathella fourtaui Pali,arv, Bull. Inst. Egypt, III, 1903, p. 



96, pi. I, fig. 3. 



Spatha subti^ouii.atera von Martens. 



Shell long elliptical, subcompressed, solid, almost equilateral, 

 the full high beaks being placed a very little in front of the 

 center and nodulously costate ; dorsal and basal lines nearly 

 straight ; anterior end rounded ; posterior end bluntly pointed 

 on the median line ; surface strongly, concentrically sculptured, 

 olive-green ; nacre pale bluish ; muscle scars large and im- 

 pressed. 



Length 80, height 56, diam. 24 mm. 



Lake Victoria Nyanza. 

 Spatha subcvquilatera von Martens, Conch. Mitt., Ill, 1887, P- 



18, pi. xij. figs. 8, 9; Besch., 1897, p. 246, pi. vii, fig. 16.— 



Simpson, Syn., 1900, p. 899. 

 Spatha baumanni Sturany in Baumann, Durch. Massai., 1894, 



p. T2, pi. XXV, fig. 38. 



Remarkable for having the beaks placed almost in the cen- 

 ter of the shell. It is a solid species with strong, concentric 

 sculpture, bluish nacre, and large, well-impressed muscle scars. 

 The shape is almost evenly long elliptical. 



Spatka sinuai-a von Martens. 



Shell somewhat elongated, subelliptical, a little wider be- 

 hind, convex, inequilateral ; beaks moderately full ; posterior 

 ridge rounded ; dorsal line lightly curved ; anterior end round- 

 ed ; base decidedly incurved medially, full behind the middle ; 



