106 



BRITISH CRETACEOUS BRACHIOPODA. 



SUPPLEMENTARY OBSERVATIONS ON THE STRATIGRAPHICAL DISTRIBUTION OF THE 



SPECIES. 



The general results in the present Monograph differ from those published by several 

 distinguished contemporaneous authors ; it will therefore be necessary to explain the 

 cause of this apparent difference of opinion. 



The most recent Catalogue of British Cretaceous Brachiopoda, is that published in 

 1847, by Mr. Tennant, 1 in which forty-nine specific names have been enumerated ; 

 but a critical examination has led me to place about twenty 2 of these, either among the 

 synonyms of species already mentioned, or as hitherto undiscovered in Great Britain ; 

 so that the entire list published by the above-mentioned author would not exceed some 

 thirty species. 



It has been stated in the fifth volume of the ' Histoire des Progres de la Geologie ; 

 (p. 109, 1851), that fifty-two species of Brachiopoda have been recorded as existing in 

 British Cretaceous Strata : the learned author mentioning at the same time that his 

 results and identifications are chiefly based on those already published in Mr. Morris's 

 ' Catalogue of British Fossils' (1843). 



1 'A Stratigraphical List of British Fossils,' p. 47, 1847. In January, 1854 (the period at which my 

 Table had been completed, see 'Bull. Soc. Geol. de France,' vol. xi), the new edition of Mr. Morris's 

 ' Catalogue' had not appeared. 



2 These are : 



1 . Crania ovalis, Woodward = C. Ignabergensis, 



Retzius. 



2. ,, spinulosa, Neilsson (not hitherto found 



in England). 



3. ,, striata, Sowerby = C. Ignabergensis. 



4. Lingula ovalis (a Jurassic shell). 



5. Orbicula laevigata, Deshayes (not aBrachiopod). 



6. Terebratula brcvirosfris, Roemer = RJiynchonella 



Martini, Mantell. 



7. Magas truncata, Sowerby = var. of M. pumila, 



Sowerby. 



8. Terebratula crijsalis, Schlotheim — young of T. 



striata, Wahlenberg. 



9. „ convexa, Sowerby = R. (lata or) 



latissima, Sowerby. 



10. ,, dilatata, Sowerby = R. compressa, 



(var.) Lamarck. 



11. ,, dimidiata, Soweiby=E. compressa, 



(var.) Lamarck. 



12. ,, elegans, Sowerby = R. latissima, 



Sowerby. 



13. Terebratula elongata, Sowerby =T. earnea, Sow. 



14. ,, /aba, Sowerby = (dwarf) T. bipli- 



cata, Brocchi. 



15. „ obliqua, Sowerby (not Cretaceous). 



16. ,, octoplicata, Sowerby = var. of R. 



plicatilis, Sowerby. 



17. „ pentagonalis, Phillips = var. of T. 



striata, Wahl. ? 



18. ,, quadrata, Sowerby = T. oblonga, 



Sowerby. 



19. ,, rigida, Sowerby = var. of T. gracilis, 



Schlotheim. 



20. „ rostrata, Sow. (a Jurassic shell). 



21. „ striatula, Mantell = Ter. striata, 



Wahlenberg. 



22. ,, subrotunda, Sowerby = var. of T. 



semiglobosa, Sow. 



23. ,, subundata, Sowerby = var. of T. 



semiglobosa, Sow. 



