CRETACEOUS PERIOD. 



487 



Leiodon, Baphiosaurus, and Coniosaurus 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 reported from different continents (Bronn) : — 

 Ostrea Larva, N. A. ; Eu. ; India. 



Gryphsea %esicularis, 

 Exogyra levigata, 

 Exogyra Bo ussinga ultii, 

 Inoceramus Crispii, 

 Inoceramus latus, 

 Inoceramus mytiloides, 

 Neithea Mortoni, 

 Pecten circidans, 

 Trigonia limbatus, 

 Trigonia aliformis, 

 Trigonia longus, 

 Hippurites organisans, 

 Nerinsea bisulcata, 

 Baculites anceps, 

 Ammonites vesp)ertinus, 



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



Eu. ; Columbia, S. A. 



Eu. ; Columbia, S. A. 



N.A.; Eu. 



N.A.; Eu. 



N.A.; Eu. 



N. A.; Eu.; India; Peru, S. A. 



N. A. ; Eu. ; India; Peru, S. A. 



N. A; Eu.; India. 



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



Eu. ; Columbia, S. A. 



Eu. ; S.W. Asia ; Peru and Chili, S. A. 



N. A. (Texas) ; Eu. 



N. A. ; Eu. ; Chili, S. A. 



N.A.; Eu. 



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. prselonga, A. simplex, 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 tc 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. sequalis Sowerby. 



same type as S. sequalis. 



scarcely distinct from N. elegans Sowerby. 



appears to be the same as /. latus Mantell. 



cannot be distinguished from I.problematicus 

 Schlot. ; reported also from the Upper 

 Green-sand of Europe. 



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

 Chalk of Europe: — Saurocephalus lanciformis, Lamna acuminata, Belemnitella 

 mucronata, Neithea Jlortoni, Ostrea Larva, Gryphsea lateralis, Gryphsea vesicu- 



Earlier Cretaceous W. of Miss. R. 

 Ammonites vespertinus Mort. 

 A. percarinatus H. & 31. 

 Scaphites Warreni 31. & H. 

 S. larvgeformid 1,1. & H. 

 Nautilus elegans, var. 

 Inoceramus latus ? 

 I. problematicus 



