98 PEOCEEDINGS OF THE MALA.COLOGICA.L SOCIETY. 



II. NON-THALASSOID SPECIES. 



The second part of this paper deals with the rest of the fauna, 

 consisting of the ordinary fresh-water forms. The total number of 

 described species amounts to about 152, but many of these are 

 evidently very slight variations. They are distributed thus among 

 the following genera : — 



LiMN^A. Natalensis, Krauss. 



Limncea Natalemis, Krauss : Siidafr. Moll., p. 85, pi. v, fig. 15; 



Kiister, Conch. Cab., pi. vi, figs. 1-3 ; Martens, Malak. Blatt., 



1866, pi. iii, figs. 8, 9; Smith, ii, p. 295. 



Six species have been described by M. Bourguignat (ii, iii) : Africana, 



Alexandrina, Dehaizei, Jouherti, Laurenti, and Lavigeriana. They are 



probably all forms of Natalensis. 



Planokbis Sudanicus, Martens. 



Planorhis Sudanicus, Martens: Malak. Bliitt., 1870, p. 35; 1874, 



p. 41 ; Novit. Conchyl., vol. iv, pi. cxiv, figs. 6-9 ; Smith, i, 



p. 349; ii, p. 294; Crosse, p. 109; Bourguignat, ii, pi. i, 



figs. 13-15 ; iii, p. 15; Martens, p. 146, var. major. 



PL Tanganikanus, Bourguignat (ii, iii), is probably the same as 



this species. 



Planoebis Alexandrina, var. 



Segmentina {Planorhula) Alexandrina, Ehrenberg, var. Tanganyicensis, 



Smith: ii, pi. xxxiv, figs. 30-306; Martens, vol. iv, p. 150. 

 Planorhula Tanganikana, Bourguignat ; iii, p. 23. 



Planoebis Beidotjxiana, Bourguignat. 



Planorhis Bridoiixiana., Bourguignat: ii, pi. i, figs. 9-12; iii, p. 20; 

 Martens, p. 149. 



Planoebis Adowensis, Bourguignat. 



Planorhis Adowensis, Bourguignat: ii, pi. i, figs. 1-4; iii, p. 17; 

 Martens, p. 147. 



Planoebis Lavigeeianus, Bourguignat. 



Planorhis Lavigerianus, Bourguignat: ii, pi. i, figs. 5-8; iii, p. 19; 

 Martens, p. 148. 



