372 CALIFORNIA ACADEMY OF SCIENCES. 



EXPLANATION OF PLATE V. 



Fig. I. Ocinebra barbarensis Gabb. Lower San Pedro series, Deadman Island. Lon- 

 gitude 19 mm.; X2. 254 



Fig. 2. Ocinebra poiilsoni Nuttall. Upper San Pedro series, San Pedro. Longitude 



31 mm. ; X2.7. 260 



Fig. 3. Scala tincta Carpenter. Upper San Pedro series, San Pedro. Longitude 19 



mm.; X2. 265 



Fig. 4. Scala indianoium Carpenter. Upper San Pedro series, San Pedro. Longi- 

 tude 21 mm.; X2. 264 



F'g- 5- Ocinebra lurida var. cerriiensis, var. nov. Upper San Pedro series. Crawfish 



George's. Type specimen. Longitude 17 mm.; Xi.3. 258 



Fig. 6. Colianbel/a (^^sopus) chrysalloidea Carpenter. Upper San Pedro series, San 



Pedro. Longitude 11 mm.; X 2. 237 



Fig. 7. Pleuroioma ( Borsonia) bartsc/ii, sp. nov. Lower San Pedro series, Deadman 



Island. Short variety. Longitude 14 mm.; Xi-3- 200 



Fig. 8. Drillia hcmphilli Stearns. Upper San Pedro series, San Pedro. Longitude 16 



mm.; X2.5. 204 



Fig. g. Ocinebra keepi, sp. nov. Upper San Pedro series, Deadman Island. Type 



specimen. Longitude 35 mm.; X2. 256 



Fig. 10. Drillia inermis Hinds. Upper San Pedro series, San Pedro. Longitude 22 mm.; 



Xi.25. 205 



Fig. II. Amphissa ventricosa, sp. nov. Lower San Pedro series, Deadman Island. Type 



specimen. Longitude 13 mm.; X2. 242 



Fig. 12. Ocinebra lurida var. aspcra Baird. Upper San Pedro series, San Pedro. Lon- 

 gitude 28 mm.; X2. 257 



Fig. 13. Margarita optabilis var. nodosa, var. nov. Lower San Pedro series, San Pedro. 



Type specimen, tilted back. Altitude 6.9 mm.; X4. 332 



Fig. 14. Margarita optabilis var. knechti, var. nov. Lower San Pedro series, San Pedro. 



Type specimen, tilted back. Altitude 8 mm. ; X3- 332 



Fig. 15. Ocinebra micheli Ford. Upper San Pedro series. Crawfish George's. Longitude 



16 mm.; X2.5. 259 



Fig. 16. Margarita parcipicia var. pedroana,vAr. nov. Lower San Pedro series, San Pedro. 



Type specimen, tilted back. Altitude 5.5 mm.; X4. 333 



