372 CALIFOKNIA ACADEMY OF SCIENCES. 



EXPLANATION OF PLATE V. 



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

 gitude igmm.; X2. 254 



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



31 mm. ; X 2.7. 260 



Fig. 3. Sca/a tmcta Carpenter. Upper San Pedro series, San Pedro. Longitude 19 



mm.; X2. 265 



Fig. 4. Scala i7idianorum Carpenter. Upper San Pedro series, San Pedro. Longi- 

 tude 21 mm.; X2. 264 



Fig. 5. Ocinebra lurida var. cerritensis, var. nov. Upper San Pedro series, Crawfish 



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



Fig. 6. Cohanbella (^'Esopus) chrysalloidea Carpenter. Upper San Pedro series, San 



Pedro. Longitude 11 mm.; X2. 237 



Fig. 7. Pleurolo?na ( Borsonia) barlschi, 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. Ociyiebra keepi, sp. nov. Upper San Pedro series, Deadman Island. Type 



specimen. Longitude 35 mm.; X2. 256 



Fig. 10. Drillia inerjnis 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. aspera 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. knechii, var. nov. Lower San Pedro series, San Pedro. 



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



Fig. 15. Ocinebra tnicheli ¥oKD. Upper San Pedro series, Crawfish George's. Longitude 



16 mm.; X2.5. 259 



Fig. 16. Margarita parcipicta vat. pedroatia^vAr. nov. Lower San Pedro series, San Pedro. 



Type specimen, lilted back. Altitude 5.5 mm. ; X4- 333 



