PLATE 37. 
Figial. 218. 1. HoLorpea syMMETRICA. 
Pig. 2. 219. 2. Hotoprea oBiiqua. 
2a. View of the aperture of a small specimen. 2b. View of the back of the shell. 
2d. Back of a larger specimen. 
Fig. 3. 220. 3. HoLopEA PALUDINIFORMIS. 
3 a. View of the back of the shell. 3b. View of the aperture. 
Fig. 4. 221. 4. Hotorea vENTRICOSA. 
4 a. View of the back of the spire. 4 b. View of the top of the spire. 
Fig. 5. 222. 10. PLEUROTOMARIA SUBTILISTRIATA. 
5 a. View of the spire of a large specimen. 5 6. Profile of the same. 
5 c, d. View of the spire and profile of the largest specimen seen. 
(Pag. 170.) 
(Pag. 170.) 
2 e. Profile view. 
(Pag. 171.) 
(Pag. 171.) 
(Bag: 4'72:) 
Fig. 6. 223. 11. PLEUROTOMARIA LENTICULARIS. (Pag. 172.) 
6 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. PLEUROTOMARIA ROTULOIDES. (Pag. 173.) 
7 a. View of the aperture and front of the shell, showing the elevation of the spire. 
7b. View of the top of the spire. 7c. View of the base, showing the umbilicus. 
Fig. 8. 225. 13. PLEUROTOMARIA SUBCONICA. 
(Pag. 174.) 
8 a. Front view of a specimen preserving the shell in a very perfect manner ; the aperture imperfect. 
8 6. Base of the same, showing the small partially closed umbilicus. 
8c. An enlarged portion of the surface, showing the cancellated striz 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. 
