PLATE XI 
Figs. 1-1f. Lymnea natalensis undussume v.Martens Series from Lubumbashi 
‘River at Elisabethville. 
Figs. 2-2c. .Lymnzxa natalensis undussumexe v. Martens. Irumu. 
Fig. 3. Lymnzxa natalensis Krauss. Port Elizabeth. 
Fig. 4. Lymnza natalensis undussumz v. Martens. Moto. 
Figs. 5-56. Lymnexa natalensis undussume v. Martens. Faradyje. 
Figs. 6-6a. Physopsis africana Krauss. Natal. 
Figs. 7-7d. Physopsis africana Krauss, variety from Stanleyville 
Figs. 8-89. Physopsis africana globosa Morelet. Elisabethville. 
Figs. 99a. Bulinus forskalit (Ehrenberg). Bambili. 
Figs. 10-10b. Planorbis sudanicus tanganikanus Bourguignat. Marigot de la 
plaine St. Louis, Tanganyika. 
