PLATE XXXV.— Continued. 
Orthoceras jaculum. 
Page 266. 
Fig. 12. A fragment, preserving eight air-chambers and a portion of the chamber of habitation. Surface- 
markings are shown over a portion of the tube. Upper Helderberg limestone at Clarence , 
Hollow, lY. Y. 
Orthoceras molestum. 
Page 265. 
Fig. 13. The chamber of habitation nearly entire, and a portion of five of the posterior air-chambers, show¬ 
ing the regular and rapid expansion of the tube to the aperture, Upper Helderberg limestone. 
Clarence Hollow, N. Y. 
Orthoceras prayum. 
# Page 255. 
See Plates 36, 81, 112. 
Fig. 14. An enlargement to six diameters of the surface of a portion of the test remaining on specimen fig. 1, 
pi. 36, showing the character of the transverse striae. 
Orthoceras procerus. 
Page 249. 
See Plates 78 A, 79. 
Fig. 15. An imperfect individual, preserving the outer chamber nearly entire, with about thirty-six septa. 
Schoharie grit, Schoharie, N. Y. 
Fig. 16. Septum of specimen fig. 1, pi. 78 A, showing the position and size of the siphuncle at the septum. 
Schoharie, N. Y. 
