Prj\TE 9. 



Fig. 1. Sauvayesia degolyeri Stanton (?). Exterior view, natural size, of a 

 fragment from the upper part of the San Felipe formation. Las Flores 

 hacienda, from an arroyo 3i kilometers west by north of Manuel station. 

 The surface shown is on a part of the shell back of the posterior siphonal 

 area. Gat. No. 32502, U.S.N.M. Page 9. 



Fig. 2. Cross section of the fragment shown in figure 1, showing the shell 

 structure. Page 9. 

 22 



