PLATE XXXIX. 
Orthoceras Bebryx, var. Cayuga. 
Tage 276. 
' See Plates 86, 91, 92. 
Fig-. 1. An internal cast, showing a portion of the chamber of habitation and fifteen of the adjacent air- 
chambers. Lower beds of the Chemung. ' Cortland, Cortland county, IV. Y. 
Orthoceras Bebryx. 
Rage 275. 
. • See Plates 38, 83, 84. 
Fig. 2. A fragment, obliquely compressed, producing an arching of the septal sutures. Hamilton group. 
Madison county, N. Y. 
Orthoceras exile. 
Page 290. 
See Plates 84, 85. 
Fig. 3. An individ®st>l nearly entire, showing the gentle constriction of the tube near the aperture, and the 
slender form of the shell. This is.the original specimen of the species, and is from the coarse 
shales of the Hamilton group at Cazenovia, Madison county, IV. Y. 
Orthoceras ehaceratum. 
Page 292. « 
See Plate 85. 
Fig. 4. The original of the species, showing the depth of the chambers and the gradual enlargement of the 
tube. Hamilton group, South Shore of Lahe Erie. 
