PLATE XXXII A. 
COLEOPRION ? TENUIS. 
Page 184. 
Pig. 1. A specimen in shale, natural size. 
Fig. 2. A portion of the same enlarged, showing the longitudinal groove and oblique striae. 
COLEOLUS CRENATOCINCTUM. 
Page 188. 
Fig. 3. A specimen in which the transverse strise Or annulations are barely perceptible. 
Fig. 4. A piece of limestone preserving portions of several individuals of this species, which are broken 
longitudinally, showing the interior filling and the thickness of the shell. 
COLEOLUS? MOHRI. 
Page 189. 
Fig. 5. A fragment of an individual imbedded in limestone, showing, in part, the interior caist with the. crys¬ 
talline shell, and the faintly striated impression of the exterior in the lower part of the specimen., 
COLEOLUS TENUICINCTUM. 
Page 185. 
Fig. 6. A specimen, natural size, which is compressed and longitudinally grooved from fracture, at both 
extremities, while the central portion is more faintly striated, and shows no longitudinal groove. 
Fig. 7. An enlargement of a fragment which is strongly striated at one end with a longitudinal depression ; 
the remaining portion being faintly striated, and preserving its natural proportions. . 
Fig. 8. Another individual, enlarged, showing the smaller extremity much flattened, strongly striated and 
longitudinally grooved. The central portion is more distinctly striated, without longitudinal 
groove, while the larger extremity has a slight longitudinal groove and stronger annulations. 
Fig. 9. A fragment enlarged. The annulating striae are regular and sharply defined, and the longitudinal 
groove is evidently due to 1 fracture. The longitudinal striae are likew'ise shown in the specimen. 
Fig. 10. An imperfect specimen, natural size, showing fine, equal and obliquely-annulating striae. 
COLEOLUS ACICULUM. 
Page 187. 
Fig. 11. An individual, natural size, which is flattened upon the surface of a slaty lamina; the. lower portion 
showing a longitudinal line of fracture, with obscure indications of transverse striae near the 
aperture. 
Fig. 12. A similar specimen to the preceding, but less distinctly preserved. 
Fig. 13. A fragment of slate, preserving a crushed specimen of this species, and a young, or the smaller 
extremity of another individual. 
Fig. 14. A small or imperfect individual of this species from the green-shale of the Portage group, in which 
occurred the original of Orthoceras aciculum. 
Fig. 15. A fragment of what appears to be the same species, preserving obscure transverse striae. The 
specimen is preserved in a soft olive shale. The transverse striae in this figure and in figure 11 
are much too strongly represented. 
Fig. 16. A crushed and imperfect individual, apparently of this species. The lower part of the imprint 
shows obscure, cancellaiing striae. 
COLEOLUS (DENTALIUM ? ) ACICULATUM. 
Page 190. 
Fig. 17. A fragment of limestone, preserving portions of two individuals. Natural size. 
Fig. 18. A part of an individual enlarged, showing the cast of the interior and the thickness of the shell. 
