1324 SPA'I'IIA 



Spatiia ktrki (Ancey). 



Shell subtrapezoid, subinflated, inequilateral, narrowed in 

 front, gradually increasing in height to the hinder end of the 

 ligament ; beaks apparently moderately elevated ; anterior end 

 rounded ; base full behind the middle ; dorsal slope raised into 

 a low wing and roundly and obliquely subtruncate behind ; 

 posterior ridge well developed, subangulate, curved, ending in 

 a point at the base of the shell ; surface lightly, concentrically 

 sculptured, greenish-brown or blackish-brown ; nacre reddish 

 or whitish. 



Length 90, height 55, diam. 29.5 mm. 



Shire River and Lake Nyanza. 

 Spathella kirki Ancey, Bull. Soc. Zool. Fr., VH, 1894, p. 229, 



figs. 4-6. 

 Spatha kirki Simpson, Syn., 1900, p. 897. 



This species is decidedly trapezoid in general outline, much 

 narrowed in front, and high, almost winged on the post-dorsal 

 region. The posterior end is obliquely curved. 



Var. licderi von Martens. 



Somewhat more elongated than the type, the height to length 

 is as I to 2 ; the anterior dorsal edge falls off less quickly and 

 the posterior edge raises less. Nacre rose-red. 



Length no, height 6r, diam. 32 mm. 

 Spatha kirki var. liederi von Martens, Besch., 1897, p. 245. — 



Simpson, Syn., 1900, p. 897. 



Spatha mabiliei Jousseaume. 



Shell oblong, widest behind, subsolid, inequilateral, scarcely 

 inflated ; beaks somewhat elevated ; anterior end narrowed and 

 rounded ; posterior end considerably wider, obliquely subtrun- 

 cate above, rounded below ; dorsal line curved ; base incurved 

 medially, full behind the middle ; surface with irregular growth 

 lines, having radial markings on the anterior half ; epidermis 

 blackish ; nacre brilliant blue, tinted green ; anterior scars deep, 

 the larger placed near the border and is oval in outline. 



Length 52, height 29, diam. 20 mm. 



Type locality, Senegal River. 



