24 



VERTEBEATA. 



or four toes on the hind foot, and their dentition is still more various. 

 The Hog is one of the few existing quadrupeds which retain the typical 

 number and kinds of teeth, the formula being : i |:| c \'_\ m I'l = 44. 

 The Solidungulates also approach the Ruminants, particularly the 

 Camel. The canines are rudimentary or wanting in the females. 



The Pachyderms were created at the dawn of the Tertiary Period. 

 The earliest of elephantoid mammals was the Mastodon, which appeared 

 in the Miocene. It was one of the first fossil animals by whose remains 

 naturalists were convinced of the possibility of extinct species. But the 

 earliest Pachyderm introduced upon our planet was a porcine beast — the 

 Choeropotamus. The hoofed Herbivore, Cori/pliodon, if numbered with 

 the Pachyderms, would dispute this honor. None of the Equine race 

 appear to be older than the Miocene (Sewalik Hills). 



No. 63. SUS SdOfa, Meyer. 



Skull. This species was coten- 

 porary with the Mammoth, and cai- 

 not be distinguished from the present 

 Wild Boar. The fossil was found ii a 

 cave at St. Didier, France, and is now 

 in the Museum of Natural History in 

 Lyons. Size, 16 x 7. Price, $4.00- 



No. 64. SriS giganteus, Falc. and Caut. 



Skull. This specimen, discovered in the Sewalik Hills, India (Miocene), is 

 preserved in the British Museum. Size, 12 x 9. Price, $3.50. 



No. 65 Stis erymanthius, Wagn. 



Palate and Teeth. This specimen from a Pleistocene deposit in Piker- 

 mi, Greece, is in the University Museum at Munich. Size, 9x4. Price, $2.25. 



No. 66. SUS SCrofa, Meyer. 



Molar. This specimen shows the characteristic tuberculate 

 surface formed by the wrinkled enamel. Price, $0.30. 



