63 



From this it appears that the Canadian, specimen combines characters that, according to 

 Hatcher, belong to both of the above genera. 



, The Cypress Hills specimen represents an animal of about the size of D. felinus, and it is 

 provisionally referred to that species, although there is not an exact agreement in the form of 

 the sectorial, and although a difference is noticed in the alignment of the molars. The 

 incompleteness of the specimen precludes a satisfactory comparison. 



Locality : — eastern escarpment of the Cypress hills, nine miles due east of Bone coulee. 

 Lawrence Lambe, 1904. 



Protbmnocyon hartshornianus (Cope). 



Plate VII, figs. 17, 18, 19 and 20. 



A left upper fourth premolar (sectorial), belonging to the collection of 1904, is referred to 

 this species. The tooth, from which the inner anterior cusp (deuterocone) has been broken 

 off, is well worn, and probably belonged to an old individual. 



This species is known from rather meagre material from the Oligocene of Colorado and 

 South Dakota. Cope has referred to his species Amphicyon harlshornianus^ certain fragments 

 of jaws, holding teeth, that Leidy,in his memoir on "The Extinct Mammalian Fauna of Dakota 

 and Nebraska," 1869, included in his description of Amphicyon vetus (p. 32. pi. I, figs. 3, 4 and 

 6). The superior sectorial, obtained in 1904 from the Cypress hills, agree3 very closely in size 

 and form (without considering the inner anterior cusp which is missing in our specimen) with 

 the sectorial, shown. by Leidy in his figure 6. • 



A second upper sectorial, also from the left side, obtained from the Cypress Hills locality 

 by Mr. T. C. Weston in 1 884, may belong to this species. It is slightly smaller than the 1904 

 specimen but is otherwise very similar. The protocone is robust and has a broad anterior 

 face ; posteriorly it narrows to a sharp, steep edge directed obliquely inward. The tritocone 

 is compressed laterally and forms a good cutting edge. The deuterocone is of fair size and 

 is well detached from the base of the protocone. A distinct cingulum encircles the entire base 

 of the crown. The posterior root is laterally compressed, its antero-posterior diameter proxi- 

 mally greatly exceeding the transverse one. The root supporting the deuterocone is likewise 

 compressed, but to a less extent. 



Measurements. 



MM. 

 Sectorial of 1884 ; plate VII, figs. 18, 19 and 20 : 



Length from posterior end to antero-external base of protocone 12-5 



Length from posterior end to antero-internal base of protocone 13 '0 



Breadth anteriorly at base of protocone 7 • 2 



Height of protocone, including cingulum 8-5 



Sectorial of 1904 ; plate VII, fig. 17 :— 



External length • • ■ • 12 ' 



Internal length 13 6 



Breadth anteriorly ... ■ 7-2 



Breadth anteriorly at base of protocone 6-3 



Height of protocone, including cingulum 8-2 



* J.884. The Vertebr^ta of the Tertiary Formations of the West. Report U, S, Geol, Survey Terrs., vol. Ill, p. 783. 



