3;»2 CALIFOUNIA ACADEMY OF SCIENCES. 



EXPLANATION OF PLATK XV. 



Fig. I. Sftnele pulchra SowERBY. Upper San Pedro series, San Pedro. Longitude 



15 mm.; X3.3. 166 



Same. Outline, sliowinij conve.xity of valve; X3-3. 166 



Tellina {Angulus) buttoni Dall. Upper San Pedro series, San Pedro. Interior 



view. Longitude 13. 5 mm.; X4.6. 157 



Same as fig. 2. Exterior view; X4-6. 157 



Semele pulchra var. motUcrcyi,\AT. nov. Lower San Pedro series, Deadnian Island. 



Longitude 14 mm. ; X3.3- '66 



Same. Outline, showing convexit)' of valve; X3.3. 166 



Thyasira bisecla Conrad. Pliocene, Deadnian Island. Longitude 74 mm.; 



XI. I. '35 



Cardium {Ringicardiuni) procerum Sowerbv. Upper San Pedro series, San 



Pedro. Exterior view. Longitude 73 mm.; natural size. 139 



Tellina {Angulus) ida Dall. Upper San Pedro series, Los Cerritos. Longitude 



62 mm.; X0.7. 'S'^ 



8. Tellina (Anguhts) bodegensis Hinds. Upper San Pedro series, San Pedro. 



Longitude 50 mm. ; natural size. '5*^ 



Tellina (Angulus) rubcsccns Hanlev. Uijper San Pedro series, San Pedro. 



Longitude 42 mm.; natural size. 159 



