



THE OTTAWA NATURADBQ# V % 



iS" 



Vol. XXVII. January, 1914 No. 10 



ON THE FORE-LIMB OF A CARNIVOROUS DINOSAUR 



FROM THE BELLY RIVER FORMATION OF ALBERTA, 



AND A NEW GENUS OF CERATOPSIA FROM 



THE SAME HORI70N, WITH REMARKS 



ON THE INTEGUMENT OF SOME 



CRETACEOUS HERBIVOROUS 



DINOSAURS.* 



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

 Vertebrate Palaeontologist to the Geological Survey of Canada. 



An unusually perfect skeleton of a carnivorous dinosaur, 

 lately added to the collections of the Geological Survey, is of 

 special interest on account of the preservation in it of one of 

 the front legs. The specimen comes from the Belly River for- 

 mation on Red Deer river, Alberta, and forms part of the very 

 large collection of reptilian and other remains made last summer 

 by the vertebrate palaeontological party which explored the 

 rich dinosaurian beds below Berry creek. 



The structure of the fore-limb in the large carnivorous 

 dinosaurs of the Cretaceous has been to a great extent con- 

 jectural. In this new specimen the right limb is preserved and 

 it is hoped that the left one Avill be revealed as the work of 

 removing the sandstone matrix proceeds. 



The first impression received of the fore-limb is its extremely 

 small size. 



The arm has been pressed upward so that the humerus lies 

 beside the back border of the blade of the scapula with its front 

 face directed forward and its inner surface outward, its head 

 remaining within the glenoid cavity. 



The fore-arm is flexed downward and the manus is closed 

 with the claw-bones uppermost. The ulna and radius lie 

 together, and the digits, of which there are two, are in place. 

 From the regular succession of the phalanges of the digits to 

 each other it is presumed that none of them is missing. The 

 digits are regarded as Nos. II and III, and there is a vestigial 

 metacarpal IV, consisting of a short, slender bone, slightly 

 curved and tapering to its distal end. 



* Communicated by permission of the Director of the Geological Survey. 



