PLATE XL1II. 
Oethooeras multicinctum. 
Page 263. 
Fig. 1. A small specimen, showing rapid expansion and closely arranged annulations. Schoharie grit. 
Schoharie, N. Y. 
Fig. 2. A larger individual, showing a contraction of the tube toward the aperture. This specimen and 
the above are the types of this species. Schoharie grit. Schoharie, N. Y. 
Fig. 3. A septate fragment of another individual, showing the air-chambers, with the* annulations greatly 
obscured by weathering. Schoharie grit. Schoharie, N. Y. 
Orthoceras nuntium, 
Page 299. 
See Plate 82. 
Fig. 4. A small specimen from the soft shales of the Hamilton group, preserving the characters of the test. 
Fig. 5. An enlargement of the lower extremity of the preceding specimen, showing the surface-markings 
and other characters. 
Fig. 6. A larger individual which is extremely compressed. From the shore of Lake Erie. 
Fig. 7. An enlargement of the surface from the preceding specimen, showing an alternating character in the 
striae. 
Fig. 8. A fragment retaining nearly its normal proportions, and showing septa throughout the greater part 
of its length—a feature which is scarcely indicated in the figure. Cazenovia, N. Y. 
Fig. 9. A small specimen, in which the lower part is coated with polished, striated shale ( slickensides ), 
obscuring the characters of the shell. Seneca Lake, N. Y. 
Fig. 10. A compressed fragment, retaining a portion of the test, on which the striae are much sharper than 
in fig. 7, which represents the surface of the internal mould. Geneseo, N. Y. 
Fig. 13. A small, compressed fragment which shows the annulations as sharply elevated, rounded ridges, 
with flattened interspaces. This feature is not fully represented in the figure. West Bloom¬ 
field, N. Y. 
Fig. 14. A large portion of an .individual, presenting characters similar to the preceding. From the soft 
shales of the Hamilton group at Geneseo, N. Y. 
Orthoceras Idmon. 
i Page 302. 
Fig. 11. A small fragment showing the frequency and character of the annulations. The specimen is 
somewh'at compressed, giving a curvature and unnatural obliquity to some of the annulations. 
Fig. 12. An enlargement of the surface, showing the regular, continuous, longitudinal striae. Hamilton 
group, Moscow, N. Y. 
Orthoceras c^elamen. 
Page 298. 
See Plates 42, 82, 113. 
Fig. 15. Enlargement of the surface of a fragment, preserving its form in an uncompressed condition, and 
perfect state of preservation, showing the longitudinal striae frequently interrupted by the 
lamellose lines of growth. Hamilton group. Seneca Lake, N. Y. 
