478 



MESOZOIC TIME REPTILIAN AGE. 



narrow, as in fig. 465, page 277. Figs. 773, 773 a, different views of a tooth 

 of Ptychodus Mortoni (Cestraciont), a species found in New Jersey. 



(b.) Reptiles. — Mosasaurus Maximiliani Goldfuss, from New Jersey, a species 

 24 feet long : a fine specimen of the cranium is in the Museum at Bonn in 

 Prussia. Fig. 774, Crocodilus clavirostris Morton, from New Jersey : whole 



Fig. 774. 



Crocodilus clavirostris ( X %)• 



length of skull (in specimen) 23 inches, greatest breadth 12J inches. Owen 

 has named two other New Jersey Crocodiles, C. basifissus and C. basitruncatm. 

 Remains of the Geosaur, according to Morton, occur in New Jersey ; also bones 

 of Turtles. 



(c.) Mammals. — Cetaceans. — Priscodelphinus grandeevus Leidy, and P. Har- 

 lani Leidy, both from New Jersey. 



HI. Fossils characteristic of the Subdivisions of the Creta- 

 ceous. 



A. Earlier Cretaceous. — No. 1 (Dakota group). Upper Missouri: Pha- 

 rella ? Dakotensis, Axin&a Siouxensis, Cy])rina arenaria, Leaves of Angio- 

 sperms. Alabama: Ceratites? Amerieanus Harper, Leaves of Angiosperms. 

 New Jersey : Leaves of Angiosperms. 



No. 2 (Benton group). Upper Missouri: Inoceramns problematicus, I. Um- 

 bonatus, Ostrea congesta, Pholadomya papyracea, Ammonites percarinatus, A. 

 vespertinus Morton ( = A. Texanus Roemer), Scaphites larvseformis. Texas: 

 Ammonites percarinatus, Tnoceramus Calculus. New Jersey : none. 



No. 3 (Niobrara group). Upper Missouri : Ostrea congesta, Tnoceramus pro- 

 blematicus, I. aviculoides, I. pseudo-mytiloides. Arkansas : Toxaster elegans, 

 Holaster simplex, Cardium mxdtistriatum, Inoceramns problematicus, I. confertim- 

 annulatus, Grypheea Pitchcri. Texas: Holaster simplex, Ejnaster elegans, Cidaris 

 hemigranosus, Gryphsea Pitcheri, Ostrea subovata (0. Marshii Marcou), Inoceramns 

 problematicus, Turrilites Brazoensis, Ammonites Texanus, Hamitea Fremonti. 

 New Jersey : none. 



