360 



Bulinus contortus (Michaud). 



The Mus. Comp. Zool. possesses three lots of this species, from 

 southern France, Syracuse (Sicily), and Corsica, which agree in 

 every respect with Michaud's original description and figures of 



contortus. 



Length Width Ap. Length Ap. Width 



9.5 6.5 6.0 3.5 mm. France 



10.0 7.0 7.0 4.0 



11.0 8.0 8.0 4.5 Corsica 



10.5 7.0 7.0 4.0 



7.5 5.5 5.0 2.5 Syracuse 



6.5 5.5 4.5 * 2.5 



Connolly (1912, Ann. S. Afr. Mus. 11, pt. 3, p. 244) records B. 

 contortus from Cape Province, S. Africa, but we have not seen 

 South African Bulinus agreeing in every respect with our Pale- 

 arctic specimens of contortus. There seems to be no difficulty in 

 separating B. tropicus and we believe that B. cyrtonotus is even 

 more distinct. 



Bulinus mareoticus (Sowerby). 



Two specimens from Lake Mareotis, Egypt, received from 

 Parreyss, at the Mus. Comp. Zool. and labelled 'mareotica,' agree 

 with Sowerby's figure of that species. It has often been regarded 

 as identical with B. contortus (Michaud), but our specimens 

 appear to be quite distinct, having among other points a much 

 lower spire and a relatively longer aperture. 



Length 



Width 



Ap. Length 



Ap. Width 



4.5 



3.0 



2.5 



1.5 mm. 



4.5 



2.5 



2.5 



2.0 



Bulinus angolensis (Morelet). 

 Plate 18, figure 10. 



Two specimens, without definite locality, from Geale's col- 

 lection, now at the Mus. Comp. Zool., were labelled 'Physa algo- 

 ensis,' Sowerby's misspelling of 'angolensis Morelet.' 1 These 

 specimens agree better with Sowerby's figure than with that of 

 Morelet. We have, however, compared them with six cotypes 



1 These were probably part of a lot collected by Geale in Damaraland, some 

 of which he sent to the British Museum (see Connolly 1912, Ann. S. Afr. Mus. 

 11, pt. 3, p. 244). 



