DESCRIPTION OB' PLATE III CONTINUED. 491 



Page. 

 Figs. 8 and 8a. Productus g.\llatinensis 361 



A dorsal valve belonging to this species. 



Fig. 8. Specimen seen from above. 

 8a. Side view. 



Hermosa formation: Bear Creek, in the Durango quadangle (station 2213). 

 Figs. 9 to 9b. Productus sp.b 363 



A ventral valve from which the shell has been largely exfoliateil. 



Fig. 9. Specimen seen from above. 



9a. Side view, in which the pose is not quite satisfactory. 

 9b. Posterior view. 



Hermosa formation: Bear Creek, in the Durango quadrangle (station 2214). 

 Fig. 10. Productus sp.b 363 



An interior of a dorsal valve referred to this spet'ies. 



Side view. 



Hermosa formation: Bear Creek, in the Durango quadrangle (station 2214). 

 Fig. 11. Productus sp.b 363 



Interior of a somewhat smaller dorsal valve. 



Specimen seen from above. 



Hermosa formation: Bear Creek, in the Durango quadrangle (station 2214). 



