363 



ength 



Width 



A p. Length 





Ap. Width 



13.0 



8.5 



7.5 





5.5 mm. 



Aapies River Fig. / 



12.0 



8.0 



8.0 





5.5 



" 2 



10.5 



7.0 



6.5 





4.0 



" 3 



12.0 



8.0 



8.0 





5.0 



" " 4 



12.5 



9.0 



7.0 





5.0 



" " 



11.0 



8.0 



7.5 





5.5 



a ti 



13.5 



8.5 



8.0 





5.5 



" 



12.5 



9.0 



7.0 





5.0 



" " 



11.5 



8.0 



7.5 





5.0 



a ti 



11.5 



9.0 



8.0 





6.0 



tt tt 



14.0 



10.0 



9.5 





5.5 



Bloemhof. Fig. 5 





Bulinus verreauxii 



(Bourguignat). 









Plate 18, figure 9. 







Two specimens obtained by Dr. P. L. Le Roux at the Farm 

 'Goedemoed,' in the Field Cornetry of Goudini, Worcester, Cape 

 Province, agree well with Bourguignat's figures of verreauxii, 

 which was originally described from the Olifants River, Trans- 

 vaal, and the 'Kynsna' (probably Knysna, Cape Province). 



The species is more slender than the other South African 

 species, with a long, semielliptical aperture and a high spire. 



Length 



Width 



Ap. Length 



Ap. Width 



13.5 



7.5 



8.5 



4.5 mm. 



13.5 



S.5 



S.5 



4.0 



Fig. 9 



Dr. Le Roux has figured four of these shells in 1929 {15th Rept. 

 Dir. Vet. Serv. Union South Africa, p. 436, fig. 18 to 21). He 

 states that some of these snails were infected with cercariae of 

 Fasciola hepatica and a Paramphistomum. 



Bulinus crystallinus (Morelet). 

 Plate 18, figure 13. 



The Mus. Comp. Zool. possesses a fairly large lot of cotypes, 

 from Angola, received from Morelet. The species is the nearest 

 approach we have seen from central Africa to B. senegalensis 

 O. F. Muller; but it has the individual whorls straighter than in 

 that species, with a trace of a shoulder below the suture. 



