Puate XVIII 
Fig. 1. Lanistes bicarinatus Germain. Leopoldville. 
Figs. 2-4. Lanistes intortus (Lamarck). Zambi. 
Fig. 5. Lanistes millestriatus Pilsbry and.»Bequaert. West Africa. Type. 
Figs. 6-10. Lanistes nsendweensis Putzeys. Brook near the Falls, Stanleyville. 
Fig. 11. Lanistes nsendweensis katanganus Pilsbry and Bequaert. Little Lu- 
bembe River. Type. “ ate 
Figs. 12-12a. Lanistes congicus C. R. Beettger. Kidada, Lukungu. 
Figs. 18-15. Lanistes congicus, variety from Boma. 
Fig. 16. Lanistes congicus fraternus Pilsbry and Bequaert. Congo River near 
Kinshasa. Type. | 
