118 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Se«. 



PLATE 13. 



MARTINEZ (lower EOCENE) FOSSILS. 



(Unless otherwise stated, all figures are natural size.) 



PAGE 



Retipirula crassitesta Gabb. 83 



Fig. 1. Back view. Canal defective. Loc. 5. L. S. J. U. Pal. Coll. 

 Fig. 2. Front view of another specimen. Loc. 4, L. S. T. U. Pal. 

 Coll. 



Cardium cooperii Gabb. 74 



Fig. 3. Right valve, X/2. Loc. 4, L, S. J. U. Pal. Coll. 



Polynices hGrnii (Gabb). 86 



Fig. 4. Back view. Loc. 4. L. S. J. U. Pal. Coll. 



Pktbcllum remondianum Gabb. 73 



Fig. 5. Drawing of top and side, X2. Loc. 4, L. S. J. U. Pal. Coll. 



Leda gabbi Conrad 76 



Fig. 6. Left valve. Loc. 4, L. S. J. U. Pal. Coll. 



Brcicliysphiitgus sinuatus Gabb. 82 



Fig. 7. Front view of .specimen in which spire is worn. 

 Fig. 8. Back view. Loc. 4, L. S. J. U. Pal. Coll. 



Perissolax blakei Conrad. 85 



iMg. 9. Back view. Loc. 4, L. S. J. U. Pal. Coll. 



Ostrca idritensis Gabb. 78 



Vig. 10. Ventral valve. X-/3. Loc. 5, L. S. J. U. Pal. Coll. 



Gyrodcs robustus. new species. 84 



Fig. 11. Top view, X/4. 



Fig. 12. Back view, XH- Loc. 4, L. S. J. U. Pal. Coll. 



Nautilus hallidayi Waring. 89 



Fig. 13. Side view of large specimen, X}4- Loc. 4, L. S. J. U. 

 Pal. Coll. 



