PLATE XII. 



POLTPHEMOPSIS LOUISVILL^ H. &. W. 



Figs. 1 and 2. Two views of a specimen enlarged to two diameters. The first figure 

 shows the aperture and columella. For description of the species, see 24th 

 Report on the State Museum, page 193. [In some copies of these explana- 

 tions printed and distributed in July, 1872, as advance sheets of the 23d 

 Report, this species was recorded as P. Kna/ppi.] 



Naticopsis ljevis Meek. 

 Fig. 3. View of the aperture, showing the height of the spire and form of the callus 

 of the columella. 

 " 4. Basal view of the same individual. 

 " 5. The spire of a larger specimen. 



PleUROTOMAHIA ISAACSII H. & W. 

 Page 238. 

 Fig. 6. Lateral view of the specimen, showing the elevation of the spire and forra 

 of umbilicus. 

 " 7. The spire of the same individual. 



NaTIGOPSIS gig ANTE a H. & W. 

 Page 238. 

 Fig. 8. Lateral view of a small individual, with an unusually high spire. 



" 9. View of the aperture of a large specimen, showing the form of the lip and 



callus, as Well as the general form of the shell. 

 " 10. A large specimen, somewhat distorted by pressure. 



