142 THE NAUTILUS. 



Type locality : Mooi River, Potschefstroom, Transvaal (Living- 

 ston). 



Type, No. 36005, coll. Walker. 



Var. duhiosus n. v. 



Shell narrower; apex more obtuse, less prominent and decidedly 

 turned to the right. 



Type locality: Pienaars Poort near Pretoria (Connolly). Also, 

 Woost Hill River. Grahamstown (Farquhar). 



Type, No. 36006, coll. Walker. 



III. Ancylus transvaelensis Craven. 



1880. Ancylus transvaalcnsis Craven, P. Z. S., London, 1880, p. 

 617, pi. Ivii, tig. 11. 



1907. ? Ancylus (Ferrissia) stenochonas O. Boettger, in Schultze, 

 " Aus Namaland und Kalahari," p. 708. 



1910.? Ancylus (Ferrissia) stenochorias O. Boettger, Abh. 

 Senckenb. Naturf. Ges. Frankfurt, xxxii, p. 450. 



Type locality: Mooi River, Transvaal (Craven). Also, Pretoria 

 District, Transvaal (Connolly); Vereeniging, Orange Free State 

 (Johnson); Prieske, Orange River system. Cape Colony (Pon- 

 sonby);? Witkop, British Bechuanaland (Boettger). 



IV. Ancylus verreauxii Bourguignat. 



1853. Ancylus verreauxii Bgt., Rev. et Mag. de Zool., 1853, p. 351. 



1854. Bgt., ibid., 1854, pi. 1, fig. 1. 

 1856. Bgt., Amen. Mai., p. 12, pi. 1, fig. 1. 

 1882. Clessin, Con. Cab., Ancylus, p. 60, pi. 5, 



fig. 4. 



1862. Ancylus verreauxii Bgt., Spicil. Mai., p. 194. 



Type locality: " Ville de Constance," Cape of Good Hope, Also, 

 Retreat, Cape Peninsula (Connolly). 



Section Ferrissia Walker, 1903. 

 Ferrissia Walker, Nautilus, XVII, p. 15. 

 Type, Ancylus rivularis Say. 



V. Ancylus burnupi n. sp. 



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

 only slightly convex, the left more than the right, anterior margin 



