SOUTHERN CALIFORNIA ACADEMY OF SCIENCES. 6i 



PECTEN ^QUISULATUS— Col. in San Pedro in March, 1897 (Dredged. 









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Ribs 



Ribs 









mm. 



"99" 

 100 

 113 



mm. 



90 

 91 

 104 



21 



21 

 21 

 22 





X 

 X 

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21 













23 













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21 





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105 



95 



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21 



22 





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103 



102 



X 



20 



21 

 29 





X 









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110 

 101 



1 7 

 95 



X 

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20 









20 



20 

 22 

 20 

 19 





X 

 X 

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X 











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102 

 118 

 105 

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95 

 113 

 101 

 100 



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22 











21 











19 













21 



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113 



105 



X 



I,ower Valve Measure- 

 ments. 



San Pedro Bay, August, 1901 — Dredged by Mr. H. B. Torrey for use in the Marine 

 Laboratory. 



21 

 22 

 21 

 21 

 22 

 23 

 21 

 21 

 24 

 23 

 19 

 22 





X 

 X 

 X 

 X 

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93 

 75 



77 

 82 

 80 



90 



74 

 70 

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 91 

 72 

 70 

 70 

 70 



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76 

 74 

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