CRETACEOUS PERIOD. 



487 



Leiodon, Raphiosaurus, and Coniosanrus are other genera of the Upper Cre- 

 taceous. The genera Ichthyosaurus, Plesiosaurus, and Pterodactylus reach even 

 into the Upper Cretaceous : Iguanodon occurs only in the Lower. 



Species of wide geographical distribution. 



The following species are 

 Ostrea Larva, 

 Gryphsea vesicidaris, 

 Exogyra levigata, 

 Exogyra Boussingaultii, 

 Inoceramus Crispii, 

 Inoceramus latus, 

 Inoceramus mytiloides, 

 Ncithea Mortoni, 

 Pecten circidans, 

 Trigonia limbatus, 

 Trigonia aliformis, 

 Trigonia longus, 

 Hij)purites organisans, 

 Nerinsea bisidcata, 

 Bacnlites anceps, 

 Ammonites vesp>ertinus, 



reported from different continents (Bronn) : 

 N. A. ; Eu. ; India. 

 N. A. ; Eu. ; S.W. Asia. 

 Eu. j Columbia, S. A. 

 Eu. ; Columbia, S. A. 

 N. A.; Eu. 

 N.A.j Eu. 

 N.A.'; Eu. 

 N.A.j Eu, 

 N.A.j Eu 

 N.A.j Eu. . 



N. A.; Eu.j S.W. Asia j Columbia, S. A. 

 Eu. j Columbia, S. A. 

 Eu.j S.W. Asiaj Peru and Chili, S. A. 

 N. A. (Texas) j Eu. 

 N. A. j Eu. j Chili, S. A. 

 N.A.; Eu. 



India j Peru, S. A. 

 India j Peru, S. A. 

 India. 



Columbia, 



The following Ammonites, according to D'Orbigny, are common to Europe 

 and South America: — A. Bogotensis, A. Dumasianus, A. Didayanus, A. galeatus, 

 A. Vandecki, A. Tethys, A. pr&longa, A. siinjilex, besides others. The Echinus 

 Toxaster complanatus is said to have the same range. 



Relations of the Earlier and Later Cretaceous of America to the 

 corresponding divisions of Europe. 



The following tables of species in the Earlier and Later Cretaceous of Ame- 

 rica, showing their relations to species of the corresponding divisions in 

 Europe, are from a paper by Meek & Hayden : — 



Lower or Gray Chalk in Europe. 



occurs in Austria. 



probably ident. with A. Woolgari Mantell. 



scarcely distinct from S. scqualis Sowerby. 



same type as S. lequalis. 



scarcely distinct from iV. elegans Sowerby. 



appears to be the same as /. latus Mantell. 



cannot be distinguished from I.problematicus 

 Schlot. j reported also from the Upper 

 Green-sand of Europe. 



Species common to the Later Cretaceous of America and the Upper or White 

 Chalk of Europe: — Sauroccphalus lancifonnis, Lamna acuminata, Belemnitella 

 mucronata, Keithca Jfortoni, Ostrea Larva, Gryphvea lateralis, Gryphiea vesicu- 



Earlier Cretaceous W. of Miss. R. 

 Ammonites vespertinus Mort. 

 A. percarinatus H. & 31. 

 Scaphites Warreni 31. & H. 

 S. larvaefonnis 31. & H. 

 Nautilus elegans, var. 

 Inoceramus latus ? 

 I. problematicus 



