Harsh Collection, Peaoody Museum. 



289 



44 



<&k 



sponding tooth in the skull of certain species of Ursus. The 

 second premolar has completely disappeared, a long diastema 

 intervening between the first and third. The third premolar 

 is implanted by two powerful roots ; its crown is composed of 

 a single, large, antero-median conical cusp, with a marked pos- 

 terior swelling, which in the unworn condition may have 

 borne a more or less distinct basal talon, or heel. The crown 

 of the fourth premolar, like those of the succeeding molars, is 

 much worn and does not display very clearly the arrangement 

 of the cusps ; it is supported by three roots, and, in the unworn 

 condition, there were apparently two external and one internal 

 cusps. Of the two external the anterior was evidently much 

 the larger, so that the crown cannot be said to have been fully 

 molariform. The cusps of the molars cannot be determined 

 satisfactorily, but it may be assumed that the first molar had 

 the typical three subequal cusps, and that the crown of the 

 second was more or less degen- 

 erate. The crowns of the lower 

 molars are also in a much worn 

 condition ; the third is, however, 

 sufficiently unworn to show the 

 simple premolariform arrange- 

 ment of the cusps, a condition 

 which without much doubt ob- 

 tained in the teeth in advance. 

 The incisors and anterior pre- 

 molars of this series are wanting 

 in the specimen. 



The humerus, figure 44, is small 

 in comparison with the size of the 

 skull. This proportional dispar- 

 ity between the size of the head 

 and body is true of quite a num- 

 ber of the Creodonts, but not of 

 all of them, as will be shown later. 

 The caput has a pyriform out- 

 line, well rounded in both direc- 

 tions, and overhangs the shaft 

 posteriorly. The greater tuberos- 

 ity is large and rises considerably 

 above the level of the head. The 

 tendinal impressions for the attachment of the spinati and 

 teres minor are large, roughened, and very distinct, indicating 

 unusual strength for these muscles. The bicipital groove is 

 wide and is placed well upon the inner side of the bone. The 

 lesser tuberosity is prominent, and there is a large rugose area 

 for the insertion of the subscapular tendon. There is a power- 



Figure 44. — Right humerus of 

 Harpagolestes macrocephalus Wort- 

 man ; front view ; one-fourth nat- 

 ural size. (Type.) 



