382 CALIFORNIA ACADEMY OF SCIENCES. 



EXPLANATION OF PLATE X. 



Fig. I. Pleurotoma ( Borsonia) hooveri, sp. nov. Lower San Pedro .series, Deadman 



Island. Type specimen. 12.7 mm.; X3. 201 



PhorcHS pnlligo Martyn. Upper San Pedro series, Crawfish George's. Speci- 

 men slightly tilted back. Altitude 17.5 mm.; natural size. 328 

 Toniatina cit/cilel/a Govi^D. Lower San Pedro series, Deadman Lsland. Longitude 



1 1 mm.; X3-2. 190 

 Columbclla solidula var. precursor, var. nov. Upper San Pedro series, San Pedro. 



Type specimen. Longitude 14.4 mm.; X^-S- 236 



Tonialina cerealis Gould. Lower -San Pedro series, -San Pedro. Longitude 



4.5 mm.; X5-5- "89 



Ac/a!0/i Oasin STEARtts. Upper San Pedro series, San Pedro. Longitude 14 mm.; 



X3- 188 



Columbella ( Astyris) tuberosa Carpenter. Upper San Pedro series, San Pedro. 



Longitude 6.5 mm.; X3. 240 



Fig. 8. Coluvtbclla (Astyris) gausapata Gould. Upper San Pedro series, San Pedro. 



Longitude 10 mm.; X3. 239 



Fig. 9. Columbella (Astyris) californiana Gaskoin. Lower San Pedro series, Deadman 



Island. Longitude 10 mm.; X3. 238 



Fig. 10. Columbella (Astyris) gausapata var. carinata Hinds. Upper San Pedro series, 



San Pedro Longitude 7.7 mm.; X3. 240 



Fig. II. Tornatina eximia Baird. Pliocene, Deadman Island. Longitude 12.5 mm.; X3. 190 

 Fig. 12. Polynices ( Neverita) recluziana Petit. Upper San Pedro series, San Pedro. 



Typical shape. Altitude 17.5 mm.; natural size. 3'4 



Fig. 13. Natica (Cryptonatica) clausa Broderip & Sovverby. Pliocene, Deadman Lsland. 



Shouldered variety. Altitude 26 mm.; natural size. 313 



Fig. 14. Pohnices (Lttnatia) lewisii Gould. Upper San Pedro series, San Pedro. Lon- 

 gitude 75 mm.; X0.66. 315 

 Fig. 15. Margarita pupilla Go\5i.T>. Pliocene, Deadman Island. Altitude 7.5 mm.; X3- 333 

 Fig. 16. Delphinoidea coronadoensis, sp. nov. Pleistocene, Sjianish Bight, San Diego. 



Type specimen, view from above. Maximum diam. 2 mm.; X5- 320 



Fig. 17. Same specimen viewed from in front; X5. 320 



Fig. 18. Cylichna alba Brown. Lower San Pedro series, Deadman Island. Longitude 



12 mm.; X1.5. 192 

 Fig. 19. Chlorostoma inontereyi Kiener. Upper San Pedro series. Crawfish George's. 



Specimen slightly tilted back. Altitude 28 mm. ; natural size. 326 



