-101 CALIFORNIA ACADEMY OF SCIENCES. 



EXPLANATION OF PLATE XXL 



Fig. I. Pec/gn dellus Conrad. Pliocene, Santa Barbara. Left valve of Gabb's type speci- 

 men of Janira bclla (No. 960, Collection Academy of Natural Sciences, Phila- 

 delphia). Altitude 80 mm., slightly enlarged. 103 



Fig. 2. Same. Right valve. 103 



