20 MANUAL OF NATURAL HISTORY. 



5. Family. — Stellerines (Rytinidse). 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 \—\ attached to 

 the gums, having no insertion in the bones ; 

 tail ending in a stiff crescent-shaped fin. 



YIT. 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. — Hip2Jopotarai (Kiip^oipotsbmidsd). 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 (Elephantidse). 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- 



