90 



DISTRIBUTION OF ANIMALS. 



[I'ART I. 



The two next orders consist of but a single family each, viz. : 



Order Fam. 



PROBOSCIDEA ... 53. Elephautidaj 

 HYRACOIDEA ... 54. Hyriicicloe 



Elephants. 

 Rock-rabbits. 



We now come to the Eodentia, a very extensive and difficult 

 order, in which there is still much difference of opinion as to 

 the details of classification, although the main outlines are pretty 

 "well settled. The foundations of a true classification of this 

 order were laid by Mr. G. K. Waterhouse more than thirty years 

 ago, and succeeding authors have done little more than follow 

 his arrangement with unimportant modifications. Professor 

 Lilljeborg, of Upsala, has however made a special study of this 

 group of animals, and has given an original and detailed classifi- 

 cation of all the genera. {Systcmatisk Ofvcrsigt af de Gnagande 

 Ddggdjurcn, Glircs. Upsala^ 1866.) 1 follow this arrangement 

 with a few slight modifications suggested by other naturalists, 

 and which make it better adapted for the purposes of this work. 



Simplicidentali 



I ]\Iurina 



(Waterhouse) 



Hystriciiia 

 (Waterhouse) 



Duplicidentati | (^^?;Srse) 



Order— RODENTIA. 



Fniu. 



55. Muridte 



56. Spak\cid;e 



57. Dipodidie 



58. Myoxidaj 



59. Saccomyidie ... 

 GO. Castoridfe 



61. Scmridte 



62. Haploodontidte 



63. Chinchillidte . . 



64. Octodontida; .. 



65. Echiniyidie 



66. Cercolabidje .. 



67. Hystricidai 



68. Caviidje 



5 69. Laoomyidse 

 \ 70. LeporidEB 



Rats. 



Mole-rats. 



Jerboas. 



Dormice. 



Pouched Rats. 



Beavers. 



Squirrels. 



Sewellels. 



Chinchillas. 



Octodous. 



Spiny Rats. 



Tree Porcupines. 



Porcupines. 



Cavies. 



Pikas. 



Hares. 



The Edentata have been classified by Mr. Turner, in the 

 Proceedings of the Zoological Society (1851, p. 205), by Dr. 

 Gray in the British Museum Catalogue, and by Professor Carus 

 in his Handlucli. The former takes a middle course between 



