OF NEW JERSEY. 27 
existing Lacertilia (Lizards) was probably whale-like in 
habit; and though not equalling these monsters in size 
was still formidable, attaining a length of thirty feet. It 
was probably in part also carnivorous. This huge reptile 
was called Mosasaurus Mitchellii by DeKay, and its re- 
mains are more numerous than any other, except those of 
the large Thoracosaurus. 
Another group of animals, the Dinosauria, while ap- 
proaching in some respects the mammals and birds, pre- 
sented more of the features of the reptiles. Many of them 
were the giants of the land of the Cretaceous time, as 
well as of its waters. Those whose remains have been 
found in the Company’s pits, are Lelaps aquilunguis 
Cope, which was carnivorous, and Hadrosaurus Foulkit 
Leidy, an herbivorous animal. 
The last was the most bulky quadruped of the period 
yet known ; a femur, or thigh bone, discovered near Had- 
donfield, measures nearly four feet in length. The animal 
is estimated by Professor Leidy to have been twenty-five 
feet long. The Lelaps has been found represented in 
the Company’s pits, only by remains sufficient to ensure 
its identification, a few small pieces from the neighbor- 
hood of Freehold, described by Professor Leidy, being 
assignable to an allied, or doubtfully to the same genus. 
As the former constitute the most complete indication of 
any individual of a carnivorous Dinosaurian hitherto dis- 
covered considerable interest attaches to them. The 
great reptile, Megalosaurus, is known by more numerous 
fragments, but they have been gathered from many diffi- 
rent localities; Dinodon is known only from its teeth, 
and Huscelosaurus, of the South African beds, by a femur 
only. 
The lightness and hollowness of the bones of the Lelaps 
