DAVENPORT. — EVOLUTION OP PECTEN, 



149 



Dorso-ventral Diameter. M = 53.080 ± 0.166 ; a- = 5.689 ± 0.117. 





t-»h-'M05 M' 



(otocoooto- 



CO en >^ hJ M • 



1-1 coo ^CT tS 



CO ^1 CO CD CO t-» • 



H- OOCCOOrf*. I— »■ 



►-■COCOCOCO' hJ' 



CO 00 .*. *. CO >-' ■ 



t-: CO -1 cc i-i h-i • 



t-» ^- I— I rf^ CO • 



en 



-.1 to t-tH-tH 



.. ..- ^'-'t>pcott>.c;corf^cocot-»h-»i-»t-ib3toi— 'to i— • 



i|-i*.*.X-.OCnCiCC>f»i^50*.0>-'*.C»tOCnrf^OCCO;DCOtO«»'tOh 



1 



