Section IV, 1919 [39] Trans. R.S.C. 



Description of a New Genus and Species (Panoplosaurus mirus) of an 

 Armoured Dinosaur from the Belly River Beds of Alberta.^ 



By Lawrence M, Lambe, F. R.S.C, Vertebrate Paleontolo- 

 gist TO the Geological Survey, Canada. ^ 



(Read May Meeting, 1919.) 



The first armoured dinosaur to be described from the Belly River 

 Cretaceous of Alberta was Euoplocephalus tutus'^ Lambe, represented 

 by the upper part of the skull and an arch of coossified, dorsal, neck 

 scutes. 



Another armoured dinosaur from the same geological horizon 

 and locality, generically distinct from any hitherto described form of 

 Stegosauria, is the subject of the present paper. 



This new genus, for which the name Panoplosaurus is now pro- 

 posed, is based on a complete skull and a considerable portion of the 

 remainder of the skeleton, discovered in 1917 by Mr. C. M. Sternberg, 

 in charge of the Geological Survey vertebrate palaeontological field 

 party of that year, 2^ miles south of the mouth of Little Sand Hill 

 creek, a tributary of Red Deer river. Alberta. The remains occurred 

 in sandstone beds of the Belly River formation, 210 feet above the 

 river level. The name mirus is given to the species represented. 



The type specimen. Cat. No. 2759, consists of the following parts: 

 The skull, practically complete, with teeth (Plates I-IV and 

 Plate XI, figure 2). 



About three feet of the vertebral column, found articulated to 

 the skull. The atlas and axis are present with probably all 

 of the other cervical vertebrse, and a few thoracic vertebrae; 

 most of these in place in natural sequence. At least three 

 cervical ribs are preserved. 



Seven scattered thoracic ribs, more or less complete, in six of 

 which the head is preserved. 



^ This paper is printed in the incomplete form in which it was at the time of 

 Mr. Lambe's death in March, 1919. 



^ Communicated with the permission of the Deputy Minister of Mines. 



' Geological Survey of Canada, Contributions to Canadian Palaeontology, 

 vol. Ill (quarto), pt. II, On vertebrata of the Mid-Cretaceous of the North West 

 Territory, 1902. Described in this publication as Stereocephalus tutus but later 

 changed by the writer to Euoplocephalus tutus as the former generic name was pre- 

 occupied. 



