37U CALIFORNIA ACADEMY Ol' SCIENCES. 



EXPLANATION OF PLATE IV. 



Fig. I. JVassa cerrilensis, sp. nov. Upper San Pedro series, Los Cerritos. Type 



specimen. Lonj^itiide 31 mm.; Xi.3. 231 



Fig. 2. Voh'u/a cv/indn'ca Cakpk\tkr. Lower San Pedro series, Deadman Island. Lon- 



j>itude 7 mm.; X2. 191 



Fig. 3. Nassa californiana Conrad. Upper .San Pedro series, San Pedro. Longitude 



38 mm.; X3- 231 



Fig. 4. Bittinm californicum Dall & Bartsch. Lower San Pedro series, San Pedro. 



Longitude 5.6 mm. ; X4. 291 



Fig. 5. Siphonalia kellettii Forbes. Ujjper San Pedro series, San Pedro. Longitude 112 



mm. ; natural size. 229 



Fig. 6. Nassa versicolor var. hooveri, var. nov. Upper San Pedro series, San Pedro. 



Type specimen. Longitude 14 mm.; X2.7. 362 



Fig. 7. Fusus ru^osus Trask. Lower San Pedro series, Deadman Island. Longitude 



50 mm. ; X1.3. 226 



Fig. 8. Sctla assimilata C. B, Adams. Lower San Pedro series, San Pedro. Longitude 



ID mm.; X4- 290 



Fig. 9. Marginella ( Volvarina) varia SowERBY. Lower San Pedro series, Deadman 



Island. Longitude 9.2 mm. ; X2 6. 222 



Fig. ID. Mitromorpha intermedia, sp. nov. Lower San Pedro series, Deadman Island. 



Tyj)e sjjecimen. Longitude 9.6 mm.; X4- 223 



Fig. II. Bitlimn rugatuin Carpentkr. Up[)er .San Pedro series, .San Pedro. Longitude 



13 mm ; X3-i- 295 



Fig. 12. Rissoa acutelirata Carpenter. Ui)iier San Pedro series, San Pedro. Longitude 



2.1 mm.; X6.7. 305 



Fig. 13. Turrilella jewetlii Cw.F^niB.v.. Pliocene, Deadman Island. Longitude 69 mm.; 



natural size. 300 



Fig. 14. Odostomia ( [vara) terricula (Carpenter) D. & B. Lower .San Pedro series, 



Deadman Island. Longitude 4 mm.; X6.7. 285 



Fig. 15. Fusus barbare7isis Trask. Pliocene, Deadman Island. Longitude 50 mm.; X1.5. 224 



