DAVENPORT. — EVOLUTION OP PECTEN. 



149 



Dorso-ventral Diameter. M = 53.080 ± 0.166 ; <r — 5.689 ± 0.117. 



0(D- 1 OS Cn **• CO CO •— OCOOO~IC5Cntf>.COtOI— <OC©CO-4CSCn*"COCOI-*©COCO~] 



MHHOH- 



tOCOCOOOtO- 



COO»^-MM- 



M CO O tO CN CO ' 



CO-I!DCCOM- 



HCOSOOlM-' 



MC0COCOCO' h-» 



CO CO tt- ><- CO ► 



' M CO a CO tO 



>-» t~ -J CO CO Cj 1-^ ' 



CO CO -3 C© I— ' H-» • 



M ^- »-'^CO» 



Co t~»cocorf*j:co*kCoco»-''-'^i— 'coco^to ** 



o 



