^CI YDLin. 



[ARMDLDJ Plate 'XXv'I.'I 



Figure a. San Pedro. — Specimen of the fossillferous sand from the lower San Pedro deposits, San 

 Pedro bluff, north of valley. Olivella intorta is the dominating species. 



Photograph by R. Arnold. 



Figure o. San Pearo.— Specimen of the tossiiiferous lower San Pedro sanostona frcrr. Dsaar:-.an 

 Island. Photograph by R. Arnold. 



