THE 



AMERICAN JOURNAL OF SCIENCE 



[FIFTH SERIES.] 



Art. VII. — The Cretaceous Armored Dinosaur, Nodo- 

 saurus textilis Marsh; by Richard Swann Lull. 

 With Plates I to IV. 



[Contributions from the Othniel Charles Marsh Publication Fund, Peabody 

 Museum, Yale University, New Haven, Conn.] 



Table of Contents. 



Introduction. 



History of discovery. 

 Extent of material. 

 Original description. 

 Morphology. 

 En do skeleton. 



Pre-sacral vertebrae and ribs. 



Pelvis. 



Caudal vertebrae. 



Fore limb. 



Hind limb. 

 Exoskeleton. 



Armor. 

 Taxonomy and relationships. 

 Family characteristics. 

 Ee-definition of Nodosaurus Marsh. 

 Eelationships with other genera. 



INTRODUCTION. 



The ^^paleontologic revival at Yale has as its first 

 fruits the naming and description of new species out of 

 old specimens in the Marsh Collection, some of which 

 have awaited recognition for nearly half a century since 

 they were exhumed. Incidentally there remains the 

 other task of redescribing, in the light of further prepar- 

 ation and of greater opportunity for comparative study, 

 such type material as had already had the scientific recog- 

 nition of the master. Of such is the type of Nodosaurus, 

 the importance of which is manifest when it is realized 

 that it is not only a generic and specific type, but that of 



Am. Jour. Sci. — Fifth Series, Vol. I. No. 2.— February, 1921. 



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