CAPE-VERDE GROUP. 623 



Genus 13. PHYSA, Drap. 

 Physa Forskalii. 



Physa Forskalii, Ehrenb., (teste Martens, Mai. Blatt. xvi.) 

 Wahlbergi, Krauss, Sudafr. Moll. (1848) 

 Dohrn, Mai. Blatt. xvi. 15 (1869) 



Morel., Journ. de Conch, xiii. 243 (1873) 



Habitat S. lago ; a cl. Dohrn deprehensa. 



This is a most variable Physa, and one which occurs in 

 many parts of continental Africa ; but, in spite of the long and 

 interesting account of it which is given by Dohrn, I do not 

 gather that he met with it on any island at the Cape Verdes 

 except S. lago. It is scarcely probable however that a species 

 which is so widely spread (occurring, apparently, from Egypt to 

 Natal, and from Abyssinia to Angola) is otherwise, in reality, 

 than pretty generally distributed throughout the archipelago. 



According to Dohrn, the Bulimus scalaris and Schmidti, 

 Dunker, the Isadora lamellosa, Eoth, and the Physa apicu- 

 lata, semiplicata, and claviculata, Morelet (the last three from 

 Angola) are all of them mere forms of this widely-scattered 

 African species. 



Grenus 14. PLANORBIS, Guett. 



Planorbis coretus. 



Planorbis coretus, Desh., An. S. V. (ed. 2) viii. 393 (1838) 

 Dohrn, Mai. Blatt. xvi. (1869) 



5, ,, Morel., Journ. de Conch, xiii. 242 (1873) 



Habitat S. Nicolao, et S. lago ; a cl. Dohrn communicatus. 



An exceedingly minute Planorbis which was taken by 

 Dohrn in S. Nicolao and S. lago (and which is remarkable for 

 its almost unsculptured, subpellucid surface, its pale whitish 

 hue, and diminutive stature, the largest of the specimens now 

 before me being scarcely a line across the widest part) has been 

 identified by him with the P. coretus, Desh. He remarks that 

 'Adanson's plate and description, apart from the erroneous 

 assertion that the shell winds to the left (which is instantly 

 refuted by the correctly drawn figure), leave nothing to be 

 desired.' 



Grenus 15. ANCYLUS, Geoff r. 

 Ancylus Milleri. 



Ancylus Milleri, Dohrn, Mai. Blatt. xvi. 18 (1869) 



Morel, Journ. de Conch, xiii. 243 (1873) 



