246 Annals of the South African Museum. 



Hab. TRANSVAAL. Eiver Limpopo (ivahlbergi, Wahlberg). Pre- 

 toria (Farquhar). 



CAPE OF GOOD HOPE. Brickfields, Grahamstown (cjradata, Far- 

 quhar). 



NATAL Pietermaritzburg ; Durban ; Thornville (Burnup). 



Also said to be found in North and East Africa, Aden, Cape Verde 

 Islands, Angola and Benguela. 



Jickeli (1874) includes in the synonymy ivahlbergi, Krs. ; lamellosa, 

 Eoth ; scalaris and schmidti, Dkr. ; fischeriana, Bgt. ; capillacea, 

 claviUata, scmiplicata, turriculata and apiculata, Morelet ; beccarii, 

 Paladilhe ; vitrea, Parr. ; and jickelii, Krs. 



521. ISIDORA. NATALENSIS (Krauss). [S.A.M.] 



1841, 43 Physa natalensis, Krs., Kiist., Conch. Cab. (Limn.) p. 8. 



pi. 1, f. 12-14. D.F. 



1848 Physa natalensis, Krs., Siidafr. Moll. p. 84. pi. 5, f. 10. D.F. 

 1856 Bgt., Eev. et Mag. Zool. viii. p. 237. D. 



,, ,, Amen, malac. i. p. 176. D. 



1869 von Mts., Mai. Blatt. xvi. p. 214. N. 



1873 Sow., Conch. Icon. pi. 10, f. 79. D.F. 



1874 Isidora natalensis ,, Jick., Fauna N.-O.-Afr. p. 196. N. 

 1883 'Physa natalica, Bgt., Ann. Sci. nat. Paris, xv. pp. 98, 126. N. 



1903 zuluensis, M. & P., A.M.N.H. xii. p. 606. pi. 32, f. 4. D.F. 

 1910 Isidora natalensis, Krs., Bttg., Abh. Senckenb. Naturf. Ges. 



Frankfurt, xxxii. p. 453. N. 



Type of natalensis in Stuttgart Museum ; zuluensis in British 

 Museum. 



Hab. NATAL. Umgeni Valley (Krauss). Durban (Burnup). 



EAST ZULULAND (zuluensis, Burnup). Lake Sibayi (Toppin). 



LORENZO MARQUES. Bikatla and Monguane Lakes (Junod). 



BRITISH BECHUANALAND. Witkop (subfossil, Schultze). 



Taking into consideration the great range of variation to be found 

 in South African fresh-water shells, it appears impossible to separate 

 zuluensis, which was likened by its joint authors to natalensis, from 

 the last-named species. 



522. ISIDORA PARIETALIS (Mousson). 



1887 Physa parietalis, Mouss., J. de C. xxxv. p. 298. pi. 12, f. 8. D.F. 



1904 ,, von Mts., Die Kalahari, p. 756. N. 

 1910 Isidora ,, ,, Bttg., Abh. Senckenb. Naturf. Ges. 



Frankfurt, xxxii. p. 452. N. 



