374 CALIFORNIA ACADEMY OF SCIENCES. 



EXPLANATION OF PLATE VL 



Fig. I. Tritoninm ( Pricne) oreg07iensis Redfielo. Pliocene, Deadman Island. Longi- 

 tude I02 mm.; natural size. 286 

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



Type specimen. Longitude 23 mm. ; X2. 201 



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



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



Ttophon ( Borco/rophon) shiarti Smith. Pliocene, Deadman Island. Longitude 



30 mm.; X2. 252 



Trophon ( Boreotrophon) orpheus var, pmairsor, var. nov. Pliocene, Deadman 



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



Trophon ( Boreotrophrn) crrritetisis, sp. nov. Lower San Pedro series, Deadman 



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



Fig. 7. Columbella (Alsopns) oldroydi, sp. nov. Lower San Pedro series, Deadman 



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



Fig. 8. Trophon (Boreotrophon) gracilis Perry. Pliocene, Deadman Island. Longitude 



26 mm.; X2. 250 



Fig. 9. Trophon ( Boreotrophoii) mulHcosfatus EsCHSCHOLTZ. Lower San Pedro series, 



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



Fig. 10. Trophon (Boreotrophon) scalariformis GouLD. Lower San Pedro series, Deadman 



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



Fig. II. Bittitim 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.; X3-3. 251 



Fig. 13. Pteurototna ( Spirolropsis) sniithi, sp. nov. Pliocene, Deadman Island. Type 



specimen. Lonj^jitude 36 mm.; X1.5. 216 



Fig. 14. Bittium (Styliferina) temcisadpta Carpenter. Lower San Pedro series, Deadman 



Island. Longitude 6.1 mm.; X4. 296 



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

 gitude 9.1 mm.; XS- 213 



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



k specimen. Longitude 16. 1 mm.; X2.5. 213 



Fig. 17. Mangilia scutpliirataT) A'Li.. Pliocene, Deadman Island. Longitude 1 1 ram ; X 3- 214 



