374 I'ALIKOKNIA A(AI)I:MV Ol' SCIKNCES. 



EXPLANATION OF PLATE VL 



Fig. I. Triloninm ( Priene) oregonensis Redfiei.o. Pliocene, Deadman Lsland. Longi- 

 tude I02 mm.; iiatur:il size. 286 

 Pleurotoma ( Borsotiia) dalli, sp. nov. Lower San Pedro series, Deadman Island. 



Type specimen. Lonj^itude 23 mm. ; X2. 201 



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



Island. Type specimen. Longitude 6 mm.; X5- 213 



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



30 mm. ; X2. 252 



Trophon ( Boreolrophou) orpfieus var. precursor, var. nov. Pliocene, Deadman 



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



Trophon ( Boicolrophm) cerritcnsis, sp. nov. Lower San Pe^lro series, Deadman 



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



Colnmhella (.-Esopits) ohiroydi. sp. nov. Lower San Pedro series, Deadman 



Island. Type specimen. Longitude 8.5 mm.; X2.6. 238 



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



26 mm.; X 2. 250 



Trophon (Boreotrophon) mul/icostaius Eschscholtz. Lower San Pedro series, 



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



Fig. 10. Tropho7i (Boreotrophon) scalariformis Gould. Lower San Pedro series, Deadman 



Island. Longitude 15.5 mm.; X2 6. 252 



Fig. II. Bittium williamsoni, sp. nov. Upper San Pedro series, San Pedro. Type speci- 

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

 Fig. 12. Trophon (Boreotrophon) pedroana, sp. nov. Lower San Pedro series, Deadman 



Island. Type specimen. Longitude 12 mm.; XS-S- 251 



F'g- '3 Pleurotoma ( Spirolropsis) smithi. .--p. nov. Pliocene, Deadman Island. Type 



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



Fig. 14. Biltium (Styliferina) tenuisculpta Carpenter. Lower San Pedro series, Deadman 



Island. Longitude 6.1 mm.; X4. 296 



Fig. 15. Mangilia interlirata Stearns. Lower San Pedro series, Deadman Island. Lon- 

 gitude 9.1 mm.; X3. 213 

 Fig. 16. Mangilia oldroydi, sp. nov. Lower San Pedro series, Deadman Island. Tyjie 



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



Fig. 17. Mangilia sciilplurala\^K\.\.. Pliocene, Deadman Island. Longitude 1 1 mm ; X3. 214 



