6o SOUTHERN CAUpORNIA ACADEMY OF SCIENCES. 



PECTEN .^QUISULCATUS— Col. Alamitos * 1893 

 Color of Lower Valve— Upper not given. 



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 J3.t! 





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75 







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Notes for Tables 

 Lo'WER Valve 

 Measurements 



Ribs 



Ribs 













mm. 



mm. 







20 



20 

 20 

 21 

 20 

 20 

 19 

 22 

 19 

 20 

 22 

 21 

 20 





X 









60 

 51 

 59 

 47 

 57 

 55 

 55 

 48 

 53 

 43 

 53 

 40 



62 

 63 

 60 

 47 

 57 

 55 

 56 

 49 

 53 

 43 

 53 

 40 



X 



Height measured from 



19 





X 









20 





X 







X 

 X 



umbo to the ventral mar- 



20 



X 











19 



X 









gin in mm. 



20 





X 







X 





23 





X 









19 



X 

 X 











21 











X 

 X 



anterior to posterior edge 



21 



X 









. 21 







X 

 X 



X 

 X 





19 















Col. in San Pedro Bay in July, 1894. 



23 

 20 

 20 

 20 

 20 

 21 

 19 

 19 

 21 

 21 

 21 

 20 











X 

 X 

 X 



........ 



X 

 X 



70 

 80 



72 



76 

 70 

 71 



75 

 75 



75 

 79 

 75 



72 



82 

 74 

 72 

 76 

 72 

 70 

 76 

 75 

 77 

 77 

 79 



X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 





















X 





























X 















X 

 X 

 X 

 X 



























♦Alamitos Bay is the extreme south of San Pedro Bay and part of the bay. 



These shells were much smaller than others. 



Pectens in the 1894 collection that had one or more crepidula on the lower valve were 

 white mottled with reddish brown where the crepidula were attached; the rest ot the 

 valve was of a saffron yellow mottled or marbled with brown. 



Upper valve measurements not given in these tables. 



