Marsh Collection, Peabody Museum. 



425 



pelvic outlet of a male Newfoundland dog, and in figure 52 

 an under view of the sacrum. The bones of this skeleton are 

 but little larger than those of Dromocyon. The difference is 

 certainly very great ; this is all the more remarkable, when we 

 remember that the skull of Dromocyon is proportionally 

 much larger than that in the dog. If, as before remarked, the 

 females had a proportionally small pelvic outlet, there seems 

 to be no escape from the conclusion that the young were born 

 in a very weak and helpless condition, like the Marsupials, a 

 fact which may have had something to do with their extinc- 

 tion, especially when it is remembered that they were exposed 



53 



Figure 53. — Pelvic outlet of male Newfoundland dog ; anterior view ; show- 

 ing dimensions ; one-half natural size. 



to competition with the rapidly developing contemporary 

 Canids. 



The Femur. (Figures 54, 55, 56, 57, 58.) — In all of its 

 essential features, the femur presents a very striking likeness 

 to that of the dog ; it is, however, proportionally a little 

 shorter and the shaft has a greater backward curvature. The 

 head is relatively larger, the neck shorter, and the trochanter 

 major of greater fore and aft extent. There is a large second 

 trochanter which is placed upon the internal margin of the 

 shaft, and an elongated third trochanter which extends well 

 down upon the outer border. The distal end of the bone is 



