426 Thorpe — Some Tertiary Carnivora in 



Both the Marsh and Cope types were collected from 

 the same geologic horizon, the former at Scott's Bluff, 

 Nebraska, and the latter in northeastern Colorado. 



The appended measurements fall well within the limits 

 given by Cope, Scott, and Matthew for C. gregarius. 



This species was by far the most abundant of the genus 

 in America. It ranged from Colorado to South Dakota 

 inclusive, and probably its habitat extended as far west- 

 ward as the interior of Oregon. It is limited in time 

 between the base of the Middle Oligocene and that of the 

 Miocene. Scott (1898, p. 364) has described in detail the 

 osteology of the species, his descriptions being based 

 mainly, and probably wholly, on White River specimens. 

 Wortman and Matthew (1899, p. 122) amplified Scott's 

 description, so that this form is quite well known. The 

 holotype, Cat. No. 11762, Y. P. M., was collected by Pro- 

 fessor Marsh in 1870. 



Besides the type, this species is represented by some 

 very excellently preserved skulls and jaws, especially 

 Cat. Nos. 10067 and 10068, Y. P. M. ; by a large number 

 of rami with dentition ; and by certain skeletal elements. 

 These are all typical and add nothing to our knowledge 

 of this form. 



Measurements. 



C. angustidens C. gregarius 

 Holotype 



mm. mm. 



Length of premolar series 19.5 19* 



Length of P 4 6 6* 



Depth of ramus at sectorial 10 10* 



Transverse diameter of crown of P 4 . . . 2.6 2.5 



Height of crown of P 4 3.8 3.8 



Width of jaw below P 4 4.3 4.5 



Depth of jaw below P 4 10 9.6 



* Measurements from holotype. Other measurements in this column are 

 from Cope's drawings (1884) of specimens identified by him as Galecynus 

 gregarius. 



Wortman and Matthew (1899, p. 124) give the skull 

 length as 76 mm. and the maximum width of the brain- 

 case as 29 mm. Cat. No. 12678, Y. P. M., collected by 

 Mr. H. B. Sargent in 1870 at Scott's Bluff, is 2 mm. longer 

 and 1 mm. wider in the same respective dimensions. 



