136 BULIvETiN 4 250 



ExPIvANATlON OF PlATK 5. 

 (15) 



Page. 



Fig. I. Venericardia planicosta var. smithi Aid 59, 173. 



Interior view of fig. 14, pi. 4.* 



2. Venericardia planicosta var. smithi Aid " " 



Exterior view,* 

 a. Interior view.* 



3. Venericardia alticostata Con, var. (from Texas) 57, 171. 



4. Astarte smithvillensis var. mediavia Harris 6t, 175* 



5. Astarte subpontis n. sp 62, 176. 



View from above. 



a. lyateral view, cast. 



b. Eateral view, gutta-percha mould. 



6. Astarte aldrichiana n. sp " " 



Exterior view, 

 a. Interior view. 



7. Crassatella gabbi Sajfford. (Type) 63, 177* 



Interior view, 

 a. Exterior view. 



8. Crassatella gabbi Safford " " 



Showing hinge structure. 



9. Crassatella gabbi? Safford, short form " " 



ID. Crassatella gabbi Safford, Brazos river, Texas.. " " 



II. Crassatella gabbi Safford, f " " " .. " " 



1 



