6 



EXTIXCT TYPE OF IJOG. 



thickness and other dimensions, except length, it will be noticed that there 

 is a close agreement between the cave specimen and that of the bull 

 terrier. In length, however, the latter exceeds the former in the ratio of 

 100 to 70, which, taken with the other dimensions, throws into strong light 

 the exceeding shortness and stoutness of the humerus in the cave exam2)lo : 



IMeasurements of the Hu.merus. 



Extreme length 



Greatest antero-posterior diameter of proximal end 

 Greatest transverse diameter of proximal end . . . 

 Greatest antero-posterior diameter of distal end . . 



Greatest transverse diameter of distal end 



Greatest antero-posterior diameter of shaft 



(Jreatest circnmfereace of shaft 



Least circumferenee of shaft 



Pi 



87 

 33 

 25 

 19 

 12 

 23 

 48 

 33 



o 



a 



s 



o 



112 

 24 

 16 

 11 

 10 

 19 

 31 

 25 



3 

 P3 



12G 

 34 

 24 

 19 

 14 

 30 

 54 

 38 



o 



a 



157 

 37 

 24 

 22 

 14 

 30 

 58 



°2h 



S p 



210 

 50 

 35 

 29 

 21 

 40 

 76 

 53 



205 

 51 

 36 

 30 

 21 

 44 

 77 

 53 



Pelvis (pi. III). — The pelvis in the jDresent species differs from that of 

 ordinary Canidce in only one important feature, namely, the high angle 

 formed by the pre- and post-acetabular portions. In respect to the relative 

 size of its different parts, and their individual contours, including even the 

 ridges and tuberosities for muscular attachment, the differences are not 

 greater, with possibly one exception, than obtains between different races 

 of the domestic dog, or between different species of the genus Cauls. The 

 posterior portion of the ilium is narrower antero-posteriorly in relation to 

 its more expanded anterior part than is the case Avith any of the other 

 types with which it is here compared. Its truly remarkable feature is the 

 high angle formed by the pre- and post-acetabular portions (pi. Ill, fig. 1), 

 which gives to the pelvis as a whole a most peculiar and striking aspect. 

 Placing the pelvis with the ventral surface upward, it is found that the 

 ischiac axis, or a line passing through the tuberosity of the ischium and 

 the center of the acetabulum, forms in the fox an angle with the plane 

 of rest of 29°; in the coyote the same angle is 31°; in the Avolf, 32°; in 

 the bull terrier, 31°; in the Newfoundland dog 32°, from which it rises 

 in the present species to 45°, or is nearly fifty per cent, greater than in 

 the others. In respect to size, the pelvis is about one fifth shorter than 

 that of the coyote, and about one tenth less in other dimensions. 



