182 DE. B. C. A. WIKDLB AND MR. F. G. PARSONS ON THE [Mar. 1, 



(10) The supinator brevis occupies the upper three quarters of the 



radius. 



(11) The flexor brevis digitorura inaniis is usually absent. 



(12) The caudo-femoralis is absent. 



(13) The ilio-tibialis is usually single. 



(14) The seniitendinosus never has a caudal head. 



Procxonid^. 



(1) The omo-hyoid is usually absent (it is present in Cercoleptes). 



(2) The rhoraboideus profundus is sometimes present (Cercoleptes). 



(3) The rbomboideus capitis is always present. 



(4) The cephalo-humeral is inserted into the humerus. 



(5) The flexor longus cubiti (biceps) is sometimes bicipital. 



(6) The pronator radii teres is usually inserted into the lower 



end of the radius. 



(7) Both palmaris longus externus and interuus are usually 



present. 



(8) The pronator quadi'atus is variable. 



(9) The supinator longus is present. 



(10) The flexor brevis digitorum maniis is usually present. 



(11) The caudo-femoralis may be present or absent. 



(12) The ilio-tibialis is usually single. 



(13) The semitendinosus always has a caudal head. 



MlJSTELID.i;. 



(1) The omo-hyoid is usually present. 



(2) The rhomboideus profundus is always present. 



(3) The rhomboideus capitis is always present. 



(4) Tbe cephalo-humeral is insei'ted into the humerus. 



(5) The triceps has an extra head from the angle of the scapula. 



(6) The pronator radii teres is usually inserted into the lower end 



of the radius. 



(7) There is usually only a palmaris longus externus. 



(8) The pronator quadra tus is variable. 



(9) The supinator longus is present. 



(10) The flexor brevis digitorum rnauiis is usually absent. 



(11) The caudo-femoralis may be present or absent. 



(12) The ilio-tibialis is usually single. 



(13) The semitendinosus may or may not have a caudal head. 



"With the view of making the characteristics of the various 

 families more evident, we have arranged them in a tabular form 

 (see pp. 180, 181). 



We propose to close this paper with an examination of how far 

 the study of the muscles helps towards determining the position of 

 one or two of the Carnivora the affinities of \^hich are somewhat 

 doubtful. In the first place, the Cheetah (Cyncelurus jubatus) is 

 known to differ from the rest cf the Fehdae in having only partially 

 retractile claws and a carnassial tooth without an inner lobe. 

 When one examines its muscular structure one notices that in 



