PLATE XXXII. 



Pecten {cuiitiuned). 



F1G8. 

 1— ;^. P. (Chlami/s) pJonr/atus, Lam. (P. 170.) 



1. Grey Chalk, Dover. York Museum, a, right valve; h, portion of the same near 



the middle of the valve x 3. 



2. Lower Chalk, Burwell. Woodwardian Museum, a, left valve; b, part of the 



same near the middle of the valve X 3. 



3. Same horizon, etc. a, right valve ; b, part of same below the middle of the 



valve X 3. (The anterior ear is displaced.) 



4 — 6. P. {Gldamys) cretosus, Defr. A. qiKidiydus zone, East Harnliam. Dr. 

 Blackmore's Collection. (P. 174.) 



4 a, left valve x 1^. 



4 h, mid-ventral ribs of 4 a X 3. 



4 c, right valve of the same specimen x Ih 



4 d, mid- ventral ribs of 4 c x 3 . 



5 a, left valve. 



5 b, part of 5 a posterior to the middle of the ventral border x 4. 



6 a, left valve. 



6 b, umbo of 6 a x 3. 



6 c, part of 6 « near the mid-ventral border x 4. 



