Sand Formation of the United States. 289 
FOSSIL BONES. 
mosasaurus? Conybeare. 
This saurian, so well known by the names of monitor, Maestricht 
animal, &c. is supposed to have been an inhabitant of the shores of 
the American continent. This inference has been drawn from a few 
teeth and vertebre found near Sandy Hook and Woodbury, in New 
Jersey. These remains have been described by Dr. Harlan, in the 
Journal of the Academy,* and by Dr. Mitchill in his notes to the 
American edition of Cuvier’s Theory of the earth. M. de Blain- 
ville,+ however, after examining the figure of a tooth given by Dr. 
Mitchill, declares unreservedly that it belongs to the genus Tehthyo- 
saurus: I am not aware that the latter has ever been found in Eu- 
rope above the Oolitic series. 
PLESIOSAURUS. 
Dr. Harlan has also describedt some remains which he considers 
to belong to this animal. They consist chiefly of vertebre, and are 
preserved in the collections of the Academy. If I recollect rightly, 
remains of this animal have not been hitherto found in sea al in 
any beds more recent than the Oolites. 
CROCODILE. DEES 
The remains of the crocodile are of frequent occurrence. Coe 
siderable portions of jaws with the teeth, and other bones, have been 
obtained near White Hill§ and Haddonfield, in N. J. and at St. 
George’s, in Delaware: at these places they otcur in. mieaceous 
blue marl. They are also found in the limestone of Gloucester: er 
WHALE? 
_ Bones of the whale are said to have been observed near 2 ies 
town Point, N. J. and on the route of the Chesapeake and Delaware 
canal: those in the Academy, which are attributed to the ha 
too imperfect to bea of a positive decision. 
SHARK. 
Teeth and vertebral ons ta abundance ; the former are frequen 
y two and a half inches long. : 
* Vol. IV. p. 232, et seq : 
t Memoires sur les Belemnites, p. 48. + _Idem. 
§ Ibidem, Vol. IV. p. 15, et seq. 
