PLATE XCI. 
Orthoceras Bebryx, var. Cayuga. 
Page 276. 
See Plates 39, 86, 92. 
Fig 1 . 1. A chambered fragment, showing a gradual increase in the depth of the air-chambers from the apex 
toward the outer chamber. Ithaca, N. Y. 
Fig. 2. A large fragment somewhat compressed, showing an obliquity of the sutures, and an irregularity 
in the enlargement of the tube, due to the compression. University Quarry, Ithaca, IV. Y. 
Fig. 3. A portion of a large individual, showing’ the cylindrical chamber of habitation, and a nearly uniform 
distance between the septa. Earl’s Quarry, Ithaca, iV. Y. 
Fig. 4. A small fragment showing the concavity of the septa. Earl's Quarry, Ithaca, N. Y. 
Fig. 5. A septum of the preceding, showing the position of the siphuncle, the effect and amount of the com- 
