20 MANUAL OF NATURAL HISTORY. 



5. FAMILY. Stellerines (Eytinidae). Skin thick, 

 hard, rugged, forming a kind of cuirass of 

 agglutinated hairs ; head small, obtuse ; nos- 

 trils at end of snout ; lips double, space be- 

 tween lips filled with strong bristles ; no 

 external ears ; teeth horny \ J attached to 

 the gums, having no insertion in the bones ; 

 tail ending in a stiff crescent-shaped fin. 



VII. ORDER PACHYDERMS (Pachydermata). 



Form heavy, unsymmetrical ; skin thick, hard, 

 deeply furrowed, generally but scantily clothed with 

 hair ; toes included in a skin and tipped with broad 

 nails, or enclosed in hoofs ; teeth often very large ; 

 some have the nose lengthened into a proboscis. 



1. FAMILY. Hippopotami (Hippopotamidse). Form 



unwieldy ; skin smooth ; head large, termi- 

 nated by a broad swollen muzzle ; mouth 

 very large ; four incisors and two canines in 

 each jaw, lower canines long, thick and bent, 

 forming large tusks ; legs very short ; four 

 toes on each foot, terminated by small hoofs. 

 Habits aquatic. 



2. FAMILY. Elephants (Elephantidae). No front 



teeth in lower jaw, two large projecting tusks 

 in upper jaw, which grow from a persistent 

 pulp ; nose greatly prolonged, forming a pro- 

 boscis of extraordinary flexibility and pre- 

 hensive power, and furnished at tip with a 

 small finger-like appendage ; limbs very mas- 



