PLATE XXXII. 
COLEOLUS CRENATOCINCTUM. 
Page 188. 
Fig - . 1. A fragment in chert, where the shell is crystallized in silica; natural size. The section below shows 
the diameter of the tube, and proportional thickness of the shell. 
Fig. 2. An enlargement from a small fragment of another individual in chert, where the surface characters 
are preserved. 
Fig. 3. An elongate tubular form in limestone, which apparently belongs to this genus and species. 
Fig. 4. A fragment of similar character with the preceding, but more curved and irregular. 
COLEOLUS TENUICINCTUM. 
Page 185. 
A small individual which is crushed at the larger end. Owing to the position of the individual, the 
strife appear to be directly transverse. 
A larger flattened specimen, which is fractured longitudinally along the centre of the exposed surface 
The striae are oblique. Figure enlarged. 
An individual with finely striated surface, the upper end of which is partially inclosed in a striated 
fold of shale. The striae on the shale are due to slipping or concretionary action. Enlarged. 
A small specimen in its natural proportions, enlarged two diameters, showing the slightly expanding 
cylindrical tube, with its characteristic annulations. 
A further enlargement of a portion of the specimen figure 8, showing the oblique annulations and 
fine longitudinal striae. 
Clathroccelia eborica. 
Page 204. 
The exposed face of the specimen in shale, showing the arching septa (or laminae), with the longi¬ 
tudinal lines obscurely indicated. 
Hyolithes ligea. 
Page 195. 
The ventral surface of a specimen, showing the faintly impressed sides with a more strongly convex 
centre. 
View of the dorsal side, showing the deeply concave margin of the aperture. 
Profile view of the same, showing the relative convexity of the two sides of the specimen. 
The dorsal surface of a specimen. From the Schoharie grit. 
A transverse section of the specimen, figure 12. 
A smaller individual of the same species (?) which has been somewhat irregular in its mode of growth. 
Hyolithes principalis. 
Page 196. 
Figs. 17-19. Three views of an imperfect specimen, showing the rapid increase in diameter, the relative 
convexity of the opposite sides, and the arching of the lip of the aperture on the convex side of 
the shell. 
Fig. 20. The dorsal surface of a large specimen supposed to belong to this species, but showing more angu¬ 
larity along the middle, and a different ratio of increase in width. 
Fig. 21. A transverse section of the specimen, figure 17. 
Fig. 10. 
Fig. 11. 
Fig. 12. 
Fig. 13. 
Fig 14. 
Fig. 15. 
Fig. 16. 
Fig. 5. 
Fig. 6. 
Fig. 7. 
Fig. 8. 
Fig. 9. 
