TAB. VI. 



Fig. 



1 . Pecten Princeps, page 3 1 . 



2. Pecten opercularis, />. 35. 



a. left valve of var. lineatus. 



b. id. var. reconditus. 



c. id. var. scabrotus. 



d. specimen -with united valves, var Audouinii. 



3. Pecten dubius, 7;. 38. 



left valve of var. partira imbricatus. 



4. Pecten pusio.jo. 33. 



a. specimen with united valves of var. striatus. 



b. left valve, var. limatus. 



c. right valve, var. striaturus. 



5. Pecten gracilis, p. 37. 



Tlie lines indicate the size of the specimens. 



