120 ORGANIC REMAINS. 



FOSSILS OF THE RED CHALK. 



Spongia? ramose subcylindrical masses Goodmanham. 



Inoceramus Cuvieri, jun. Speeton Cliff. 



Terebratula subglobosa, jun. Ditto. 



Belemnites Listeri PL I. fig. 18. ... Speeton, Goodmanham, &c. 



Serpula PL I. fig. 17- ... Speeton Cliff. 



THE fossils of the Yorkshire chalk, enumerated in the preceding 

 catalogues, are all which have fallen under my inspection ; and they 

 have been obtained almost exclusively from a particular part of the 

 stratum, and indeed chiefly from one very favourable locality. Con- 

 siderable additions to their number may, therefore, be reasonably ex- 

 pected, when the lower beds are more accurately examined ; but it 

 appears to be the truth that the chalk-pits inland are as unproductive 

 as a part of the sea-cliffs is rich in organic remains. 



At present the deficiencies in the Yorkshire series when compared 

 with the chalk formation generally, are most observable in the mollus- 

 cous and crustaceous tribes of animals, and in the reliquiae of fishes and 

 reptiles. With regard to the latter groups, geologists know that these 

 fossils are not spread, like shells, over a vast extent of country, but often 

 confined to limited localities. The zeal and industry of Mantell have 

 discovered them abundantly in Sussex, but few other parts of the chalk 

 range in England, or on the continent, can be quoted for comparison. 

 The species of fossil shells are not in any district very numerous in the 

 chalk, but in Yorkshire some remarkable kinds are yet undiscovered ; 

 as plagiostoma spinosum, ostrea vesicularis of Lamarck, (grypha?a globosa 

 of Sowerby,) terebratula carnea, and t. plicatilis, of France and England, 

 and the cirri and trochi of Wiltshire and Sussex. 



The fossils, however, which are known to occur in the chalk of York- 

 shire, are precisely those which have been always noticed by geologists 



