PLATE XLIV. 



GOMPHOCERAS EXTMIUM. 



Page 329. 

 Pig. 1. An indiviiiual slightly compressed, preserving a large portion of the chamber of habitation and thir- 

 teen air-chambera ; showing the gibViosity of the shell and the slope of the sides toward the 

 apertui-e. Coluinhus, 0. 

 Fig. 2. A smaller individual, much disturbed by compression, and showing some variation in the depth of 

 the iui--cliambei-8, compared with the preceding. 



The specimen is fi-om the lower limestone of the Upper Helderberg group, in the vicinity of 

 Buffalo, N. Y. 



