46 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. ()2 



Insectivores : 



Galeopithecus No hypotrochanteric fossa 



Erinaceus 



Cetaceans : 



Merounga 



Rodents : 



Hydrochoerus 



Beaver 



Rabbit 



Ungulates : 



Camel 



Bison {B. urns) 



Horse 



Deer 



Antelope 



Marsupials, Edentates, Monotremata, Chiroptera : 



Macropus 



Anteater 



Dasypus 



Duckbill " 



Pteropus 



None of the above mammals below the primates, it is seen, shows 

 the hollow under consideration, though a fossa or groove mesially 

 to the generally marginal gluteal ridge, serving possibly to the ad- 

 ductor muscle, is not uncommon. However, the bones of but one 

 individual of each kind were examined, and many forms are not 

 represented at all. Yet the uniformity of the showing, together with 

 the fact that the gluteal ridge, usually sharp and mostly inconspicuous, 

 forms in these mammals a portion of the lateral border and thus 

 leaves no room for the fossa, speak for the probability that the hypo- 

 trochanteric fossa is essentially or even entirely a primate character. 

 Furthermore, it has been shown previously in this paper that among 

 the primates the hollow belongs almost exclusively to the anthropoid 

 apes, particularly the three large genera, and to man. There is surely 

 something of interest in this distribution. 



SUMMARY 



The present study has thrown light on many details of the feature 

 under consideration, some of which are quite new; but, as usually 

 happens, while clearing some problems, the inquiry has raised others 

 which call for further research, particularly that on the musculature 

 and other soft parts of the region in question. 



The points of paramount interest that issue from the work are 

 in brief these: 



