Fig. 



TAB. V. 



1. Pecten Islandicus, page 40. 



2. Pecten tigrinus, p. 27. 



a, var. Isevis, left valve, outside view. 



b. 

 c. 

 d. 



e. 



S. right valve, ditto. 



/3. right valve, ditto. 



y. right valve, ditto. 



y. left valve, ditto. 



7. id., showing a different mode of growth- 



exoletus, right valve. 



3. Pecten Bruei, p. 29. 



a. right valve. 



b. left valve. 



4. Pecten similis, ^.25. 



a. left valve, with a single divergence of coloured lines. 



b. id., with zigzag lines. 



c. right valve. 



5. Pecten Gerardii, p. 24. 



a. right valve. 



b. left valve. 



The lines indicate the size of the specimens. 



