﻿PLEISTOCENE MAMMALIA. 



d. The Ribs and Sternum. 



Hyaena possesses fifteen pairs of ribs, which are much arched, causing the cavity of 

 the chest to be large as compared with that in Canis, and very large as compared with 

 that in Fells. The sternum includes eight sternebrse. Neither ribs nor sternum present 

 any features of special importance, 



e. The Shoulder Girdle (PL IX). 



The scapula in //. crocuta is straighter, and the postscapular fossa relatively smaller 

 than in H. striata. The coracoid process is very little marked in Hyaena, and the clavicle, 

 which is minute and more or less oval in outline, is entirely suspended in the muscles. 



Table of Measurements of the 



Scapula. 





H. crocuta, 



No. 522 1 College of 



Surgeons,). 



11. xpela'a — crocuta, 

 Creswell (Owens 

 College Museum). 



11. spelce:i =■ crocuta, 



Wookey ( Taunton 



Museum), A. 



Length along line of spine 1 17'8 



19-53 ' 



20-95 



An tero-posterior diameter of neck 



4-2 



525 



4-6 



Maximum length of glenoid cavity 



4'45 



4-5 



4-5 



Diameter from highest point in spine 

 to point on inner surface of scapula 

 immediately below 



4-95 



425 



4-0 



Length from end of coracoid process 

 to surface of bone behind glenoid 

 cavity 





6-0 



60 



f. This Anterior Limb (Pis. X, XI). 



The humerus of Hyaena is a well-marked bone. Its form is short and robust, with 

 an exceptionally large great tuberosity. The condyle is larger and more pronounced 

 than in Canis, the radial part being specially large. The deltoid crest extends further 

 down the shaft in //. crocuta than in //. striata. The humerus differs from that of 

 Canis, Ursus, and Mustela in nearly always having a supra-trochlear foramen. There is 

 no entepicondylar foramen such as occurs in Canis and Mustela, and neither an 

 ectepicondylar foramen nor crest occurs. 



The manus of Hyaena differs from that of all other Carnivora in having the pollex 

 represented by only a rudimentary metacarpal, which resembles a sesamoid bone. The 

 metacarpals are longer and less enlarged above the phalangeal articulation than in Fells. 



