PLATE 06 . 
Page 
Fig. 1-5. Pleurotomaria labrosa. 339 
1 a. An imperfect specimen from the Sliaiy limestone. 
1 b. An enlargement of the surface of the same. 
2 a. A cast of the same species : view of the aperture, which is filled with stone. 
2 b. View of the exterior of the specimen. 
3 a. The exterior of a specimen where the shell is mostly removed, showing the spiral band 
and the sinuosity in the peristome. 
3 b. View of the aperture of the same, showing the thickened columellar lip. 
3 c. An enlargement of the surface markings. 
4 a. b. Two views of another individual, showing in one of the figures the thickened lip, which, 
on the upper side, extends as far as the marginal sinus. 
5 a, b. Two views of a crushed specimen, showing in one of the figures the externally thick¬ 
ened columellar lip. 
