PLATK IX. 



Flattostoma turbinata var. cochleata. 



Page 28. 

 Figs. 1. 8. The <q>p08ito rides of an irregularly coiled siMJcimen, showing a moderately elevated spire. 

 Vig. 3. The «i»ertiire of an inilividual, with more elevated spire and nairower form. The lower side of 



the latil volution shows a depressed line mai-king the jwsition of a notch in the outer lip. 



The si>ecinien is slightly umbilicate. 

 tig. 4. Knlargenient of the striie whoi-e cni8.sing the line of the notch in the outer volution. 

 Fig. S. Apertural view of a sjiecimen having a line indicating a notch in a liigher position on the volution 



than the preceding, only visible on the outer volution and obsolete at the lip. The inner lip 



of the ajH!rture is disunited fi-om the columella. 

 Fig. 6. An individual with the outer volution disunited and much contracted near the aperture. 

 Fig. 7. Dorsal view of the same siiecimen. 



Fig. S. A larger in<Uvidual, showing a double sinuosity in the outer lip. 

 Figs. 9-11. A still lai-ger specimen, having an indistinct l)aud bordering the suture. 



Platyostoma turbinata. 



Page 37. 



Figs. 13, 13. Two views of a young individual with a nearly flattened spire. 



Figs. 14, 15. A larger specimen of similar character, with a dein-essed spire and a broad, shallow sinuosity 

 in the lip. 



Figs. 16, 17. Two \"iews of a still larger specimen, with the spires somewhat depi-essed below the outer volu- 

 tion, and the depression bordei-ed in part by a sulcated band, in<licating a slit in the aperture 

 at that stage of gi-owth. 



Figs. 18, 19. A similar specimen accidently compressed and shortened, and showing the center of the sinu- 

 osity marked by a pi-ojecting point on the lip. 



Figs. 20, 21. Two views of the specimen fi-om which the species was onginally described. 



Rg. 22. An ai)ertin-al view of a specimen differing somewhat in the form of the columella and apei-ture 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. 35, 26. Two views of the original specimen, from which Mr. Conratl's descrijition was taken. 



Platyostoma turbinata var. 



Page 29. 

 Fig. 27. The aperture of a young individual bearing considerable resemblance to P. turbiiiata vai% 



cochleata. 

 Figa. 38-30. A characteristic full-grown specimen of this variety. 



Platyostoma pleurotoma. 



Page 30. 

 Figs. 31-33. Three views of a sjiecimen of this species. 



Fig. 34. The ajierture of a large individutd, 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 Sti-ophostylua, while the surface characters 

 •nd form of volution are clearly characteristic of Platyostoma. 



