PLATE 37. 



Fig. 1. 218. 1. HoLOPEA SYMMETRICA. (Pag. 170.) 



Fig. 2. 219. 2. HoLopEA OBLIQUA. (Pag. 170.) 



2 a. View of the aperture of a small specimen. 2 b. View of the back of the sliell. 2 e. Profile view. 



2 d. Bade of a larger specimen. 



Fig. 3. 220. 3. HoLOPEA paludinifokmis. (Pag. 171.) 



3 a. View of the back of tlie shell. 3 b. View of the aperture. 



Fig. 4. 221. 4. HoLopEA ventricosa. (Pag. 171.) 



4 a. View of the back of the spire. 4 b. View of the top of the spire. 



Fig. 5. 222. 10. Pleurotomakia subtilistkiata. (Pag. 172.) 



5 a. View of the spire of a large specimen. f> b. Profile of the same. 



5 c, d. View of the spire and profile of the largest specimen seen. 



Fig. 6. 223. 11. Pleurotomaria lenticttlaris. (Pag. 172.) 



a. View of the spire (the specimen is a cast). 6 b. Lateral view, showing the elevation of the spire. 



6 c. Base of a smaller specimen (a cast), showing the umbilicus. 6 d. Front view, showing the aperture. 



Fig. 7. 224. 12. Pleitkotomaeia rotuloides. (Pag. 173.) 



7 a. View of the aperture and front of the shell, showing the elevation of the spire. 



7 4. View of the top of the spire. 7 c. View of the base, showing the umbilicus. 



Fig. 8. 225. 13. Pleuhotomaeia sitbconica. ( Pag. 174.) 



8 a. Front view of a specimen preserving the shell in a very perfect manner ; the aperture imperfect. 

 S b. Base of the same, showing the small partially closed umbilicus. 



8 c. An enlarged portion of the surface, showing the cancellated striae which are scarcely visible to the naked 



eye. 

 8 d. Cast of another specimen. 8 e. Front view of the same, showing the form of the aperture. 



