PLATE 66. 



Fig. 1-5. Pleurotomaeia labrosa. 339 



1 a. An imperfect specimen from the Shaly 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 o. 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 tlie aperture of the same, showing the thickened columellar lip. 



3 c. An enlargement of the surface markings. 



i a, b. Two views of another individual, showing in one of the figures tlie 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. 



