394 CALIFOHNIA ACADEMY OF SCIENCES. 



l6l 



EXPLANATION OF PLATE XVL 



Fig. I. Macoma indcniala Carpenter. Upper San Pedro series, Los Cerritos. Longitude 



50nim. ; natural size. i6i 



Fig. 2. Macoma calcarea Gmelin. Lower San Pedro series, Deadman Island. Longitude 



i8 mm.; X2.3. 

 Fig. 3. Macoma nasiila Conrad. Upper San Pedro series, San Pedro. Large, typical 



specimen. Longitude 75 mm.; natural size. 163 



Fig. 4. Macoma inquinaia Deshayes. Upper San Pedro series, San Pedro. Longitude 



42 mm.; natural size. 162 



Fig. 5. Macoma secta Conrad. Upper San Pedro series, San Pedro. Longitude 82 mm.; 



natural size. 164 



Fig. 6. Macoma yotdiformis Carpenter. Lower San Pedro series, Deadman Island. 



Longitude 24 mm.; natural size. 165 



Fig. 7. Venus {Chione) gnidia Broderip & Sowerby. Upper San Pedro series, San 



Pedro. Exterior of right valve. Longitude 96 mm.; natural size. 147 



