374 CALIFORNIA ACADEMY OF SCIENCES. 



EXPLANATION OF PLATE VL 



Tritoiiiuni ( Priene) orep;onensis Redfield. Pliocene, Deadman Island. Longi- 

 tude 102 mm.; natural size. 286 



Pleuroioma ( Borsonia) dalli. sp. nov. Lower San Pedro series, Deadman Island. 



Type specimen. Longitude 23 mm. ; X 2. 201 



Mangilia inlerfossa var. pedroana, var. nov. Lower San Pedro series, Deadman 



Island. Ty[)e specimen. Longitude 6 mm.; XS- 213 



Trophon ( Boreolrophon) stuarti Smith. Pliocene, Deadman Island. Longitude 



30 mm. ; X2. 252 



Trophoyi (Boreolrophon) orpheiis var, precursor, var. nov. Pliocene, Deadman 



Island. Type specimen. Longitude 15 mm.; X2.7. 253 



Trophon ( Boreoirophrji) cerritcnsis, sp. nov. Lower San Pedro series, Deadman 



Island. Type specimen. Longitude 32 mm.; X2. 249 



Columbella (yEsopiis) olJroydi, sp. nov. Lower San Pedro series, Deadman 



Island. Type specimen. Longitude 8.5 mm.; X2.6. 2j8 



Trophon (Boreolrophon) gracilis Perry. Pliocene, Deadman Island. Longitude 



26 mm.; X 2. 250 



Trophon (Boreolrophon) f?utllicoslalus EscHSCHOLTZ. Lower San Pedro series, 



Deadman Island. Longitude 10 mm.; X2.6. 251 



Trophon (Boreolrophon) scalariformis Gould. Lower San Pedro series, Deadman 



Island. Longitude 15.5 mm.; X2-6. 252 



Billium williamsoni, sp. nov. Upper San Pedro series, San Pedro. Type speci- 

 men. Longitude 2.9 mm.; X7-2. 295 



Trophon (Boreolrophon) pedroana, sp. nov. Lower San Pedro series, Deadman 



Island. Type specimen. Longitude 12 mm.; X3 3. 251 



Pleuroioma (Spirotropsis) srnilhi, sp. nov. Pliocene, Deadman Island. Type 



specimen. Longitude 36 mm.; Xi-S- 216 



Billium (Styliferina) lenuismlpta Carpenter. Lower San Pedro series, Deadman 



Island. Longitude 6.1 mm.; X4- 296 



Mangilia inlerlirala Stearns. Lower San Pedro series, Deadman Island. Lon- 

 gitude 9.1 mm.; X3. 213 



Mangilia oldroydi, sp. nov. Lower San Pedro series, Deadman Island. Type 



specimen. Longitude 16. i mm.; X2.5. 213 



Mangilia sculphiralaV)h\.\.. Pliocene, Deadman Island. Longitude 11 mm ; X 3. 214 



