200 Transactions of the Royal Society of South Africa. 



Subgenus spiralina Hartmann, 1899. 



Planorbis (Spiralina) anderssoni Ancey, 1890. 



1890. Planorbis anderssoni Ancey, Bull. Soc. Mai. Fr. vii, p. 161. D. 

 Hah. L. Marques. Hangwane ; Nwambukoto, Rikatla (Junod). 

 Six examples, quite typical of this species as identified by Ancey from 

 Durban. 



Genus Segmentina Fleming, 1818. 



Subgenus hippeutis Agassiz, 1837. 



Segmentina (Hippeutis) junodi (Conn.), 1922. 



(Plate IV, fig. 30.) 



1922. Hippeutis junodi Conn., A.M.N.H. x, p. 121. D. 



Hab. L. Marques. Nwambukoto, Rikatla (type) ; Hangwane (Junod). 



The extreme declivity of the outer lip from suture to periphery seems 

 to distinguish H. junodi from other African members of the subgenus. 



Cawston has collected some young examples of another species at Beira, 

 but they are too immature for exact identification. 



Family ANCYLIDAE. 



Subfamily FERRISSIINAE. 



Genus Ferrissia Walker, 1903. 



F err issia junodi sp. n. 



Shell small, conical, rather depressed, irregularly oval, narroM'ing 

 posteriorly, rather thin, translucent, corneous, brownish black ; surface 

 glossy, growth lines regular, rather strong, apex strongly microscopically 

 radially striate, blunt, considerably inclined to the right, situate less than 

 one-fifth of total length from posterior margin. Anterior margin broadly 

 rounded, posterior rather narrowly so ; right lateral margin nearly straight, 

 left much curved, both inclined posteriorly towards each other. Anterior 

 slope regular, slightly curved, posterior and right lateral slopes nearly 

 straight and very steep. 



Long. 4-1 ; lat. 2-4 ; alt. 1-25 mm. 



Hab. L. Marques. Nwambukoti Pool, Rikatla (Junod). 



The animal appears to be sinistral, with a broad pallial lobe on the left 

 side between the mantle and the foot ; the soft parts, however, were greatly 

 shrivelled in the only specimen in which they were available for examination. 



The jaw (text-fig. 26, D) is brown, and may be said to consist of a median 



