THE OTTAWA NATURALIST 



Vol. XXXI. OCTOBER, 1917. No. 7. 



A NEW GENUS AND SPECIES OF CRESTLESS HADROSAUR 

 FROM THE EDMONTON FORMATION OF ALBERTA.* 



By Lawrence M. Lambe, F.R.S.C. 

 Vertebrate Palaeontologist, Geological Survey, Canada. 



The Edmonton formation of the Cretaceous as developed on Red 

 Deer river, A! although not as rich in ceratopsian 



the earlier Belly River beds, abounds in well preserved remains of 

 hadrosaurs belonging to such recently described gener urolophus, 



Cheneosaw I Hypacrosaurus, form- which succeeded the crested 



Stephanosaurus and Prosaurolophus of Belly River times. 



It has become evident that a non-crested hadrosaur of large size, 

 represented by excellent and comprehensive material in the Geological 

 Survey collections from the Edmonton formation of Red Deer river, 

 belongs to a genus and s] . iot hitherto described. The purpose of 



this paper is to give a preliminary description of this new form, with 

 particular reference to the skull, reserving for the future a fuller 

 account of its osteology which the nt state of the material will 



permit. 



This i: -us is represented in the collections by the remains of 



two individuals of the same size including the skull in each ca 



The first specimen (type) consists, of the skull (figured in plate 

 II) with the following important parts of the skeleton: most of the 

 vertebra 1 , in place, back to the sixth caudal; one hind limb lacking a 

 few phalanges; one humerus; both pubic bones; one ischium; the 

 greater part of the right ilium; and some ribs. Collection of 1912, 

 Edmonton formation, Red Deer river. Alberta, from opposite the mouth 

 of Three Hills creek, at 200 feet above the river level. Cat. No. 2288. 



The second specimen (paratype) includes: the skull, without 

 the premaxillaries and the predentary; all the vertebrae with the excep- 

 tion of those behind the fifth caudal; and the fore and hind limbs 

 lacking some of the bones of the feet. It is possible that the right 



tmmunicated with the permission of the Acting Deputy Minister of 

 Mines. 



