THE TYPE OF THE JURASSIC REPTILE MOROSAURUS 

 AGILIS REDESCRIBED, WITH A NOTE ON CAMPTO- 

 SAURUS. 



By Charles W. Gilmore. 



Of the Departnienf of (jeology, V. S. National Museum. 



INTRODUCTION. 



In l.S89'^' Prof. O. C. Marsh described briefly Morosanrifs agUis^ a 

 new species of the Morosaiirida?. 



The type specimen (Cat. No. 5384, U.S.N.M.'') which was collected 

 b}' Mr. M. P. Felch from the Upper Jurassic (Morrison Beds) of 

 ""Garden Park." near Canon City, Colorado, is now preserved in the 

 fossil vertebrate collection of the U. S. National Musemn. 



The several elements comprising- the type specimen were recently 

 carefully prepared and important characters, hitherto unobserved 

 because of adhering- matrix, were disclosed. On account of the 

 exceedingly brief original designation of this species, as well as new 

 characters recently noted, the writer V)elieves it of importance to 

 describe and figure the specimen more in detail than was attempted by 

 Professor Marsh. 



REVIEW OF THE TYPE MATERIAL. 



Marsh's original description of the species is as follows: 



MOROSAURUS AGILIS, sp. nov. 



A second new species, which apparently belongs to the same genus, is represented 

 by the posterior half of the skull, the anterior cervical vertebra-, and other parts of 

 the skeleton. This animal was in direct contrast with the one '' last described, the 

 skull and skeleton being especially light and delicate in structure for one of the 

 Sauropoda. It was also much smaller in size, being the most diminutive known 

 member of the genus, probably not more than fifteen feet in length. 



«0. C. Marsh, Amer. Jour, of Sci., XXXVII, April, 1889, p. 334. 

 ^Marsh's original accession numbers are as follows: |1607| and | 12 , 1904 catalogue 

 number of the Yale University Museum. 



f Marsh refers here to M. grandis, a larger species described in the same paper. 



Proceedings U. S. National Museum. Vol, XXXII— No. 1519. 



151 



