PLATE IX. 
Platyostoma turbinata var. cochleata. 
Page 28. 
Figs. 1, 2. The opposite sides of an irregularly coiled specimen, showing a moderately elevated spire. 
Fig. 3. The aperture of an individual, with more elevated spire and narrower form. The lower side of 
the last volution shows a depressed line marking the position of a notch in the outer lip. 
The specimen is slightly umbilicate. 
Fig. 4. Enlargement of the striae where crossing the line of the notch in the outer volution. 
Fig. 5. Apertural view of a specimen having a line indicating a notch in a higher position on the volution 
than the preceding, only visible on the outer volution and obsolete at the lip. The inner lip 
of the aperture is disunited from the columella. 
Fig. 6. An individual with the outer volution disunited and much contracted near the aperture. 
Fig. 7. Dorsal view of the same specimen. 
Fig. 8. A larger individual, showing a double sinuosity in the outer lip. 
Figs. 9-11. A still larger specimen, having an indistinct band bordering the suture. 
Platyostoma turbinata. 
Page 27. 
Figs. 12, 13. Two views of a young individual with a nearly flattened spire. 
Figs. 14, 15. A larger specimen of similar character, with a depressed spire and a broad, shallow sinuosity 
in the lip. 
Figs. 16, 17. Two views of a still larger specimen, with the spires somewhat depressed below the outer volu¬ 
tion, and the depression bordered in part by a sulcated band, indicating a slit in the aperture 
at that stage of growth. 
Figs. 18, 19. A similar specimen accidently compressed and shortened, and showing the center of the sinu¬ 
osity marked by a projecting point on the lip. 
Figs. 20, 21. Two views of the specimen from which the species was originally described. 
Fig. 22. An apertural view of a specimen differing somewhat in the form of the columella and aperture and 
also in the height of the spire. 
Figs. 23, 24. A large individual, ridged and plicated on the outer volution. 
Platyostoma unisulcata. 
Page 26. 
Figs. 25, 26. Two views of the original specimen, from which Mr. Conrad’s description was taken. 
Platyostoma turbinata var. 
Page 29. 
Fig. 27. The aperture of a young individual bearing considerable resemblance to P. turbinata var. 
cochleata. 
Figs. 28-30. A characteristic full-grown specimen of this variety. 
Platyostoma pleurotoma. 
Page 30. 
Figs. 31-33. Three views of a specimen of this species. 
Fig. 34. The aperture of a large individual, showing the twisting of the columella and the form of the shell. 
Fig. 35. Partial side view, showing more distinctly the twisting of the columellar lip.* 
* The columellar lip in these individuals resembles that of Strophostylus, while the surface characters 
and form of volution are clearly characteristic of Platyostoma. 
