276 



THE SCIENCE OF LIFE. 



Digitigrada walk on the tips of the toes, and keep the 

 heel raised above the ground. It includes the fierce and 

 powerful Cats, Pole-cats, Ferrets, Weasels, Dogs, Hy- 

 aenas, Jackals, Otters, etc. The Cats, (Felidce^) embracing 

 Lions, (Fig. 169,) Tigers, Leopards, Panthers, and Cat;-, 



Fir,. j^o. Skeleton of the Lion, (Fells I.co^ C. Cervical vertebrae. D. Dorsal verte- 

 bra:. L. Lumbar vertebra. S. Sacral vertebrae. C. d. Caudal vertebrae, a. Scapula. 

 b. Humerus. c. Ulna. d. Radius, e. Metacarpus and phalanges, f. Ilium, g. Femur. 

 h. Ischium. /. Patella, k. Tibia. /. Fibula, m. Tarsus, n. Os Calcis. o. Metatarsus 

 and phalanges. 



have retractile claws, and the radius rotates freely on the 

 ulna. They have also a prickly tongue. 



Order 12. Quadrnmana (four-handed) differ from all 

 other Mammals by having each of their four limbs termi- 

 nated by hands, in which the thumb is opposable to the 

 other digits. (Fig. 170.) 



The order is subdivided according to the position of 

 the nostrils, into I. Strepsirhines, or Monkeys with 

 twisted nostrils, as the Lemurs and Aye-ayes, which 



