THE NAUTILUS. 141 



Var. capensis n. v. 



Shell rather thin, translucent, oval, brownish horn color, darker 

 on the apex ; surface with fine, regular growth-lines and very fine, 

 close, somewhat irregular radial striae ; apex prominent, subacute, 

 strongly turned to the right, but not much deflected except at the 

 extreme tip; anterior slope convex, somewhat flattened towards the 

 apex ; posterior slope concave ; right slope convex ; left slightly 

 concave. 



Length 7.5, width 4.5, alt. 2.5 mm. 



Type locality : Lakeside, Cape Peninsula (Connolly). Also, 

 Hoot Bay, Cape Peninsula (Connolly) ; Woost Hill River and 

 Blaukrantz River, Grahamstown (Farquhar). 



Type, No. 36004, coll. Walker. 



Var. trapezoidens O. Boettger. 



1907. Ancylus trapezoideus O. Bcettg., in Schultze, " Aus Nama- 

 land und Kalahari," p. 708, 



1910. Ancylus trapezoideus O. Boattg., Abb. Senckenb. Naturf. 

 Ges., Frankfurt, xxxii, p. 45, pi. 28, fig. 15. 



1897.? Ancylus caffer, v. Mt?., Beschalte, p. 151, pi. 1, fig. 19a, 

 c and d. 



Type locality : Witkop, British Bechuanaland. Sub-fossil. Also, 

 Pretoria (McBean) ; Pretoria District (Connolly) ; Valsch River, 

 Lindley, Orange Free State (Connolly); Crocodile Drift, Transvaal 

 (Connolly) ; Zoutspansberg, Transvaal (Cragoe) ; ? Bach Tararo, 

 Umdussuma (Stuhlmann). 



II. Ancylus mooiensis n. sp. 



Shell slightly obovate, the greatest width being in front of the 

 center; thin, translucent, shining, light horn-color ; surface with 

 regular, but very fine, growth-lines and exceedingly delicate, wavy, 

 radial striae ; apex about half-way between the center and the pos- 

 terior margin, subacute, not prominent, but slightly turned to the 

 right and very little deflected ; anterior slope convex, but flattened 

 above and nearly straight as it approaches the anterior margin ; 

 posterior slope long and regularly, but not deeply, concave; right 

 slope slightly convex ; left nearly straight, slightly concave about 

 half-way down. 



Length 6.25, width 3, alt. 2.5 mm. 



