PLATE XXIV. 



Fig. 1. Clionella tholoides, n. sp. . 



a. The natural size. 



b. The shell, enlarged. 



Fig. 2. Clionella exsculpta, n. sp. 



a. The natural size. 



b. The shell, enlarged. 



The apex, magnified 20 diameters. 



c. The apex, magnified 30 diameters. 



Fig. 3. Pleurotoma (Thesbia) platamodes, n. sp. . 



a. The natural size. c. The sculpture, magnified 20 diameters. 



b. The shell, enlarged. 



Fig. 4. Pleurotoma (Pleurotomella) pruina, n. sp. 



a. The natural size. c. The apex, magnified 25 diameters. 



b. The shell, enlarged. 



Fig. 5. Pleurotoma (Drillia) incilis, h. sp. 



a. The natural size. 



b. The shell, enlarged. 



c. The apex, magnified 25 diameters. 



d. The sculpture, magnified 50 diameters. 



Fig. 6. Pleurotoma (Ti/phlomangelia) lithocolleta, n. sp. . 



e. The sculpture, magnified 10 diameters. 



a. The natural size. 



b. The shell, enlarged. 



Fig. 7. Pleurotoma (Mangelia) incincta, n. sp. 



a. The natural size. c. The apex, magnified 20 diameters. 



b. The shell, enlarged. 



Fig. 8. Pleurotoma (Perrona) marmarina, n. sp. ... 



a. The natural size. 



b. The shell, enlarged. 



c. The sculpture, magnified 60 diameters. 



d. The same, magnified 10 diameters. 



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