3l»S fALIFOUNIA ACADKMV OK SCIENCES 



EXPLAXATION OF PLATE XVIU. 



Fig. I. Kfllia suborbictilaris Montagu. Lower San Pedro series, Deadniaii Island. 



Interior view of left valve. Longitude 8 mm. ; X4.3. 137 



\'\f,. \a. Same specimen. Outline, showing convexity of valve; X4.3. 137 



Fig. 2. Pandora ^ Kennei lia) bicarhiaia Carpenter. Lower San Pedro series, Deadman 



Island. View of imperfect left valve. Longitude 14 mm. ; X3. 123 



Fig. 3. Pandora (K'etincr/ia) Jilosa Cw.fF.ni'E'R. Lower San Pedro series, Deadman Island. 



Left valve. Longitude 15 mm.; X3. 124 



Fig. 4. Area labiata Sowerdv. Upper San Pedro series, San Pedro. Longitude 28 mm.; 



XI. 3- loi 



Fig. 5. Diplodonia scrrkata Reeve. Upper SAn Pedro series, San Pedro. Longitude 



10.2 mm.; X3.3- '34 



Fig. 5«. Same. Outline, showing convexity of valve; X3.3. 134 



Fig. 6. Nucula supras/riata Carpenter. Upper San Pedro series, Los Cerritos. Longi- 

 tude 7 mm.; X4.7. 96 

 Fig. 7. Kellia laperousii Deshaves. Lower San Pedro series, Deadman Island. Interior 



view. Longitude 23 mm. ; X2. 137 



Fig. 7a. Same. Outline, showing convexity of valve; X2. 137 



Fig. 8. Diplodonta orbella Gould. Lower San Pedro series, Deadman Island. Longitude 



9.2 mm.; X3.3. 134 



Fig. 8a. Same. Outline, showing convexity of valve; X3.3. 134 



Fig. 9. Glycymeris barbarensis Conrad. Upper San Pedro series, San Pedro. View of 



interior. Longitude 25 mm. ; xi-3. 100 



Fig. 10. Glycymeris septcntrionalis Middendorff. Upper San Pedro series, San Pedro. 



View of interior. Longitude 22 mm. ; XI.3. 'oi 



Fig. II. Ne(zra pectinala C\KPF.^TEK. Lower San Pedro series, Deadman Island. Imper- 

 fect valve. Longitude 6.5 mm. ; X5.4. 181 

 Fig. 12. Astarle {Crassine//d) brannen sp. nov. Upper San Pedro series, Los Cerritos. 



Type specimen, interior view. Longitude 1 1.2 mm. ; X2.7. 127 



