IX PRELIMINARY SKETCH OP THE 



Order I. — Primates. Four incisors in each 

 jaw, and one canine: genera, Homo, Simia, 

 Lemur, Vespertilio. 



Order II. — Brut a. No incisors in either jaw ; 

 seven genera : Rhinoceros, Elephas, Triche- 

 chus, Bradypus, Myrmecophaga, Manis, Da- 

 sypus. 



Order III. — Ferae. Six conical incisors in 

 each jaw for the most part ; ten genera : Phoca, 

 Canis, Felis, Viverra, Mustek, Ursus, Didelphis, 

 Talpa, Sorex, Erinaceus. 



Order IV. — Glires. Two incisors in each jaw ; 

 no canines ; ten genera : Hystrix, Lepus, Cas- 

 tor, Mus, Sciurus, Myoxus, Cavia, Arctomys, 

 Dipus, Hyrax. 



Order V. — Pecora. No fore-teeth in the 

 upper jaw, six or eight in the under; eight 

 genera: Camelus, Moschus, GirafFa, Cervus, 

 Antilope, Capra, Ovis, Bos. 



Order VI. — Belluce. Obtuse fore-teeth in 

 each jaw ; four genera : Equus, Hippopotamus, 

 Sus, Tapir. 



Order VII. — Cete. No uniform character of 

 teeth ; aquatic pectoral fins ; spiracula ; four ge- 

 nera : Monodon, Balaena, Physeter, Delphinus. 



The generic characters of the Mammalia, 

 like those of the orders, are mostly taken from 



