32 Gigantic Lacerta. 



projected. He said that the head part appeared about three 

 or four feet long."* 



Genus Mosasaurus, Conybeare. 

 Maesteicht monitor, Cuv. 

 Ossemens Fossiles, vol. v. part 2, ed. 3d, p. 310; Harlan, Journ. Acad. Nat 

 Sciences of Philad. vol. iv. pi. xiv. ; Silliman's Joiirnal, vol. xvii. ; Dekay, 

 Ann. of the Lye. of New York, vol. iii. pi. xiii. p. 134. 



Locality. — From a " marl pit" near Woodbury, Monmouth 

 county, New Jersey. 



Specimens of the teeth, and probably of the femur, in the 

 cabinet of the Academy of Natural Sciences, and the jaw teeth 

 in the cabinet of the Lye. Nat. Hist. N. York. 



These remains are completely fossilized and impregnated 

 with iron, dense and heavy, and of a deep dark colour. The 

 teeth of the second series, whilst they yet remain in the sockets, 

 are serrated on the edges. 



Place in the Geological scries. — Atlantic secondary, of New 

 Jersey. 



Gexus Geosaurus. Cuv. 

 Lacerta gigantea. Soemmering. 

 G. Mitchelli. Dekay. 



Ann. of the Lye. Nat. Hist, of New York, vol. iii. p. 138, pi. iii. fig. 3, 4. 



Dr Dekay has established the existence of this genus in the 

 United States, upon a fossil tooth, with a small portion of jaw 

 attached. 



" From various considerations we should be disposed to place 

 this tooth among the most anterior of the lower jaw. Its ele- 

 vated position on its osseous support, places it in the group 

 of IMosasaurus and Geosaurus, while its compressed shape re- 

 moves it from the former. The tooth now described agrees 

 with those of the Geosaurus in shape, attachment and mode of 

 dentition." 



Judging from the size of the tooth, the American species 



• Bai-on Braunsberg Bfaximillian Prince de Weid, during his recent visit 

 to Philadelphia, on his return from the Eoeky Mountains, informed me that 

 he had obtained the fossil skeleton of a saurian animal, fifteen feet in length 

 from the " great bend" of the Missouri river, which, on comparison of its clia- 

 racters with those of the animal above noticed, he thinks belongs to the s-ame 

 species. 



