PLATE XCYIL 
Cyrtoceras jemulum. 
Page 371. 
See Plate 98. 
Fig. 1. Lateral view of a compressed fragment, showing the curvature of the tube and the irregular annula- 
tions of the internal mould, corresponding to the external ornaments of the test. Schoharie 
grit. Schoharie, N. Y. 
Fig. 2. A larger portion of an individual, showing the irregularity of the annulations on the internal mould 
and the curvature of the outer portion of the tube. Schoharie grit. Schoharie, N. Y. 
Fig. 3. The apical portion of an individual, showing the curvature of the tube toward the apes, and the 
extension of the lamellose expansions of the test into the surrounding rock. Schoharie grit. 
Clarksville, N. Y. 
Fig. 4. A small septate fragment, showing the depth of the air-chambers and the concavity of the septa. 
Schoharie grit. Schoharie, N. Y. 
Fig. 5. A septum of the preceding, showing the amount and direction of compression to which the tube has 
been subjected, and the position of the siphuncle. 
Fig. 6. An imperfect fragment, showing the curvature of the tube and the depth of the air-chambers. 
Schoharie grit. Schoharie, N. Y. 
Fig. 7. A septum of the preceding, showing the transverse section of the tube. 
Fig. 8. Lateral view of a chambered fragment, showing the relations of the suture-lines and the annula¬ 
tions of the internal mould, and the regularity of the air-chambers. Schoharie grit. Seho- 
harie, N. Y. 
Fig. 9. A septum of the preceding, showing compression in a direction oblique to the ventro-dorsal axis. 
The specimens figs. 4, 6 and 8 are referred to this species, as agreeing in the amount of 
curvature, apical angle, and the depth of the air-chambers, but possessing few other distinc¬ 
tive features. 
Cyrtoceras eugenium. • 
Page 369. 
See Plates 36, 47, 96. 
Fig. 10. A fragment retaining a portion of the chamber of habitation and several attached air-chambers. 
Schoharie grit. Schoharie, N. Y. 
Fig. 11. A septum of the preceding, showing the transverse section and the position of the siphuncle. 
