Vol. XVI, pp. 1-2 February 21, 1903 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



A NEW SAUROPOD DINOSAUR FROM THE 

 JURASSIC OF COLORADO. 



BY J. B. HATCHER. 



The remains upon which this paper is based were discovered 

 and collected by Mr. W. H. Utterback in the lower Jurassic, 

 in the quarry long worked by the late Professor Marsh, and 

 situated some eight miles north of Canyon City, Colorado. 



Haplocanthus priscus, gen. et sp. nov. 



The type (No. 572, Carnegie Museum Collection) of this genus and 

 species consists of the two posterior cervicals, ten dorsals, five sacrals 

 with the ilia, ischia and pubes and the nineteen anterior caudals, two 

 chevrons, a nearly complete series of ribs, and a femur, all in an excel- 

 lent state of preservation. 



The present genus and species can be distinguished from the known 

 genera and species of the Dinosauria by the following characters: Neural 

 spines of posterior cervicals and anterior dorsals absolutely simple instead of 

 deeply bifurcated as in all other known genera of the Sauropoda. Sacrum 

 composed of five vertebrae firmly coossified by their centra and func- 

 tioning as sacrals. Sacral ribs and diapophyses greatly expanded trans- 

 versely so as to appear proportionally low and broad. Neural spines of 

 sacrals very short, only moderately expanded transversely, the three 

 anterior coossified forming a long bony plate. Pubes massive and united 

 by an extended cartilaginous pubic symphysis which is interrupted 

 1— Pboc. Biol. Soc. Wash. Vol. XVI, 1903. (1) 



