PLATE XXXVIII. 



Pecten (continued). 

 P. {^quipecten) Beaveri, Sow. (P. 188.) 



FlQS. 



1. Chalk Marl, Dover. York Museum, a, left valve; b, posterior portion X 3. 



2. H. suhglohosus zone, Slielford Lime-kiln, Grog-ma-gog Hill. Woodwardian 



Museum, a, right valve (the ears are drawn from another specimen) ; 

 h, antero-ventral portion of left valve of the same specimen. 



3. H. suhglohosus zone, Cherry Hinton. Woodwardian Museum. Interior of part 



of right valve, showing byssal sinus. 



