PLATE IV. 
Figs. 1-4. Exogyra subplicifera Felix (p. 41). 
Figs. .">. <;. Lima inteblineata sp. n. (p. 43). 
Fig. 5. Type specimen, natural size. 
Fig. 6. Pari of sculpture, enlarged •"> diameters. 
Fig. 7. Exogyra potosina Castillo and Aguilera (p. 41). 
See PI. III. fig. 7. 
Figs. 8, i>. 1<>. Gervillia corrugata sp. n. (p. 4<>). 
Fig. 8. Right valve with most of the shell exfoliated. 
Fig. 9. Left valve of another specimen in same state of preservation. 
Fig. 10. Small distorted left valve showing strong sculpture of umbo. 
Figs. 11, 12. Pecten insutus sp. n. (p. 44). 
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