PLATE XXI. 



PAGE 



Fig. 1. Clathurella circumvoluta, n. sp. . . . . . .357 



a. The natural size. 

 6.J The shell, enlarged. 



c. The apex, magnified 35 diameters. 



Fig. 2. Pleurotoma (Rhaphitoma) rhysa, n. sp. . . . . . 310 



a. The natural size. 



b. The shell, enlarged. 



c. The apex, magnified 25 diameters. 



d. The sculpture, magnified 75 diameters. 



Fig. 3. Pleurotoma (Drillia) sterrha, n. sp. .... . . . 305 



a. The shell, natural size. , c. The operculum, magnified. 



b. The sculpture, magnified 5 diameters. 



Fig. 4. Pleurotoma (Mangelia) hypsela, u. sp. . . . .341 



a. The natural size. | b. The shell, enlarged. 



Fig. 5. Pleurotoma (Bela) phceacra, n. sp. . . . . .313 



a. The natural size. | /). The shell, enlarged. 



Fig. 6. Pleurotoma (Surcula) rotundata, u. sp. . . . . .290 



a. The shell (restored), natural size. | b. The sculpture, magnified 6 diameters. 



Fig. 7. Pleurotoma (Mangelia) tiara, n. sp. . . . .347 



a. The natural size. ! c The apex, magnified 30 diameters. 



b. The shell, enlarged. 



Fig. 8. Borsonia silicea, n. sp. . . . ... . 369 



a. The natural size. j c. The sculpture, magnified 15 diameters. 



b. The shell, enlarged. 



Fig. 9. Clathurella hormophora, n. sp. . . . . .351 



a. The natural size. ! c. The apex, magnified 40 diameters. 



6. The shell, enlarged. 



