18 



PLEISTOCENE MAMMALIA. 



D. TiiK Ribs and Sternum. 



Hj/ana possesses fifteen pairs of ribs, which are much arched, causing the cavity of 

 the chest to be lar<fe as coniparecl with that in Cani.s, and very hii'gc as couii)ared Avitli 

 that in Felis. The sternum includes eight sternebrse. Neithei" ribs nor sternum present 

 any features of special importance. 



E. The Shoulder Girdle (PI. IX). 



The scapula in II. crociila is straightcr, and the postscapular fossa relatively smaller 

 than in //. striata. The coracoid process is very little marked in Ilyaina, and the clavicle, 

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



Table of Measurements or the 



Scapula. 







II. crocnta, 



No.522iCollegeof 



Surgeons). 



H. nulma = crocida, 

 Creswell (Owens 

 College Museum). 



H. »i)el<ea = crocnta, 



Wookey (Taunton 



Museum), a. 



Length along- line of spine 



17-8 



19-55 ' 



20-95 



An tero-posterior diameter of neck 



•i-2 



0-25 



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 



4-95 



4-25 



4-0 



Length from end of coracoid process 

 to surface of bone behind glenoid 

 cavity 





6-0 



GO 



Figured. 



F. The Anterior Limb (Pis. X, XI). 



The humerus of Ilijceua 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 j)art being specially large. The deltoid crest extends further 

 down the shaft in //. crocnta than in II. 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 Ili/ana differs from that of all other Carnivora in having the pollex 

 rc[)resented by only a rudimentary metacarpal, which resembles a sesamoid bone. The 

 metacarpals are longer and less enlarged above the [)halangeal articulation than in Felis. 



