NOTES ON THE CANIDiE OF THE WHITE KIVEE, OLIGOCENE. 349 



VI. The Hind Limb. 



The pelvis is represented by several specimens belonging to D. vetus, D. hartshorn km us 

 and D. felinus, all of them incomplete, but so supplementing one another, that the shape 

 of the os innominatum may be determined, with the exception of the anterior border of 

 the ilium, which is unfortunately missing from all the individuals. 



So far as it is preserved, the pelvis is rather feline than canine in character, both in 

 its general outlines and in its details of structure. The neck or peduncle of the ilium is 

 wider and shorter than in Canis, narrower than in Felis ; the anterior plate expands to 

 its full width somewhat more abruptly than in the latter, but enough of the broken 

 fossils remains to show that the iliac plate has the' narrow form which is found in the 

 cats and does not expand so much at the free end as in the modern dogs. The gluteal 

 surface is not simply concave, as it is in the two recent genera mentioned, but is divided 

 into two unequal fossae by a prominent longitudinal ridge, such as occurs, though not so 

 prominently developed, in certain viverrines. This feature is repeated in another White 

 River dog, Cynoclictis, and is almost duplicated in the contemporary sabre-tooth, Dirndls, 

 another of the many correspondences between Daphcenus and the early Machairodonts. 

 The sacral surface is placed much less in advance of the acetabulum than in Canis, and 

 occujiies about the same relative position as in the cats. The ischial border of the ilium 

 is, for most of its length, nearly straight and parallel to the acetabular border, but 

 descends more abrivptly than in either the recent dogs or cats, and follows a course more 

 like that seen in Viverra. As in Canis, the acetabular border is more distinctly defined 

 than in the true felines, and ends near the acetabulum in a long, roughened prominence, 

 the anterior inferior spine. The pubic border is very short, and hence the iliac surface 

 is not well defined. The acetabulum is of moderate size and has somewhat more elevated 

 borders than in the cats. 



The ischium, which in the existing Canidai is much shorter than the ilium, is very 

 elongate, and is proportionately even longer than in the felines. The anterior portion of 

 this element is straight, rather slender, and of obscurely trihedral section ; behind the 

 acetabulum the dorsal border is arched upward into a convexity, the spine of the ischium, 

 terminated abruptly behind by the ischiadic notch, which is as conspicuous as in the cats. 

 while in Canis it is very faintly marked. The posterior part of the ischium is expanded 

 into a broad and massive plate, which is very rugose upon the external surface. This 

 posterior portion is not so strongly everted and depressed as in the modern dogs, and 

 there is no such stout and prominent tuberosity, which, again, constitutes a resemblance 

 to the cats. 



The pubis is L-shaped and its anterior, descending limb is unusually long, broad 

 and thin, much more so than in the felines or modern dogs. The obturator foramen is 



