144 THE NAUTILUS. 



VIII. Ancylus fontinalis n. sp. 



Shell small, depressed, long, oval, narrow, lateral margins parallel 

 and nearly straight, anterior margin regularly rounded, posterior 

 margin slightly truncated on the right side ; thin, white ; growth- 

 lines very fine and regular ; apex about half-way between the center 

 and the posterior margin, rounded, obtuse, quite prominent, only 

 slightly turned to the right ; anterior slope long and nearly straight ; 

 posterior slope oblique, straight from the base of the apex to the 

 margin, lateral slopes oblique, nearly straight, slightly incurved 

 towards the margin. 



Length 3.25, width 1.8, alt. 0.8 mm. 



Type locality : Ranjesfontein, Pretoria District (Connolly). 

 Also, Morgendal, Orange River Colony and Pienaars Poort, Pre- 

 toria (Connolly). 



Type, No. 36010, coll. Walker. 



IX. Ancylus victoriensis n. sp. 



Shell minute, rather narrow, slightly obovate, the greatest width 

 being at the anterior third of the length, anterior and posterior mar- 

 gins regularly rounded, lateral margins slightly curved, the left more 

 than the right ; thin ; light greenish horn-color ; lines of growth 

 rather coarse and irregular, more or less rippled on the anterior 

 slope ; apex posterior, large, prominent, obtuse, scarcely, if at all, 

 turned to the right ; anterior slope very convex ; posterior slope 

 very short, nearly straight and scarcely oblique ; lateral slopes about 

 equally convex, the apex being in the longitudinal axis of the shell. 



Length 2.25, width 1.5, alt. 0.75 mm. 



Type locality : Victoria Falls, Zambesi River (Connolly). 



Type, No. 36011, coll. Walker. 



X. Ancylus zambesiensis n. sp. 



Shell minute, subdepressed, short oval, anterior and posterior 

 margins broadly rounded, lateral margins about equally curved ; 

 light greenish horn-color ; surface with lines of growth distinct and 

 irregularly rippled on the anterior slope ; apex rather prominent, ob- 

 tuse, in the longitudinal axis of the shell and not perceptibly turned 

 to the right ; anterior slope slightly convex ; posterior slope oblique 

 and straight ; lateral slopes oblique and only slightly convex. 



Length 2.25 ; width 1.6; alt. 0.75 mm. 



Type locality : Victoria Palls, Zambesi River (Connolly). 



Type, No. 36012, coll. Walker. 



