O. C. Marsh—Restoration of Brontosaurus. 85 
Fatat Drnosaurs. 
Remains of a very small dinosaur were found in immediate 
relation with the type specimen of Morosaurus grandis. These 
remains, which consist of a complete femur, the larger portion 
of both.humeri, and several vertebra, show no essential differ- 
ences from the large specimens except in size, and indicate an 
animal of perhaps seven feet in length, and little more than two 
feet in height. The imperfect ossification of these bones indi- 
cates that the animal was very young, and it seems probable 
that it was foetal. The only other similar case known in the 
Dinosauria is the apparent embryo observed by the writer in 
Compsognathus.* 
CLASSIFICATION, 
The various genera of the Sauropoda, and in fact of the 
Dinosauria in general, cannot at present be distinguished by the 
detached teeth. In one form, however, the teeth are quite 
peculiar, and the dentition appears to offer generic characters. 
genus. Later investigations indicate that they belong to the 
Sauropoda, and there is some evidence that they are the teeth 
of Diplodocus. 
The main characters of the order Sauropoda, and of the two 
families now known to belong to it, are as follows: 
Order Savuropopa. Herbivorous. 
verse processes. 
Family Adantosauride. Anterior vertebre opisthoccelian. 
Ischia directed downward, with extremities meeting on median 
line. Anterior caudals with lateral cavities. A pituitary canal. 
* U * . 
Anterior caudals solid, Pituitary fossa only. 
Yale College, New Haven, July 12th, 1883. 
* This Journal, xxii, 340, November, 1881. 
