8/3 CEETACEOUS PELECYPODA 



I do not need to repeat here the importance of the study of the fossil forms 

 of Pelecypoda in order to attain this object of natural classification ; and I will 

 only append a table showing the different groups, &g., which I shall adopt in 

 the course of my monograph. The characteristics of each order, family, fee, will 

 be found in their respective places ; and the reason for doing this has already been 

 explained in the preface. I begin with what I consider the highest order. 



Class,— PELECYPODA. 



I. Order,— PHOLADACEA. 



1. — Family FJSOLABIBJE, fsuh-fam. teejsdinin^ ^ndi prolabin^J.. 



2- 5j GASTROCK^NIB^, fsub-fam, gastrocejbninjs, clavagel-^ 



II. Order, — MYACEA. 



^.—Family MYIB^, fsuh-fam, corbulin^ and myinm), 



^' - MACTBIJ)^, (suh-fam, lvtuariinje and mactrinmJ, 



ANATINIB^, f suh-fam. pandorinje, trraciin^, anatinin^J. 



SAXICAVIBJE, 



GLA UCONOMYIDJE, 



SOLFNID^, (sub'fam, solenin^ and pharellin^J, 



III. Order,— TELLINACEA. 

 ^.—Family FAFSIIDJE. 



10. „ SCBOBICULARIIB^, f suh-fam. cumingiinje and semelinje). 



11. „ TELLINIB^, C suh-fam, garinm, tellininm, and cAPsmm). 



12. „ BONACIBJS. 



IV. Order,— VENERACEA. 

 'l^.~Family FFTBICOLIBJE. 



14. „ VFNFRIB^, f suh-fam. tapesin^e, fenerin^, sunettinm, dom^ 



15. „ GLOSSIB^. 



16. „ CYRFNIB^,. 



17. „ GAUBIIBJE, (suh-fam. carbiin^ and lymnocardiinmJ. 



V. Order,— CHAMACEA* 

 1^.— Family VFRTIGORBIIB^, 



19. „ TBIBACNIBuFI, 



20. „ CHAMIB^, 



21. „ CHAMOSTRFIBJE. 



22. „ HIFRURITIBjE. 



