POKCUPINES. 
G1 
fonnd both in the Old and New Worlds, are all covered with 
stout variegated spines, although in some of the species these 
are hidden in the long thick hair. Of the Old-W orld Porcupines, 
JrlLjstricidce, the Porcupine of Southern Europe, Hystrix cristata 
(921), is now becoming very rare, but several closely allied 
species are common in India and the Malay Archipelago. They 
feed on fruit, bark, and roots, and live in burrows of their own 
construction. The American Porcupines, Eretlihontulce^ are [Case 11. j 
typified by the Canadian Porcupine, dorsatus (92S), 
but also include the South-American Tree-Porcupines, Synetheres 
or Coendou (928) , &c., which are wholly arboreal and have long 
Fia-. .34. 
Skull of the Porcupine. The outer part of the hone of the left side of 
the lower jaw has been removed to show the whole length of the 
incisor tooth. 
i, incisors ; pm, premolar ; m, molars. 
prehensile tails. The Chinchillas and Viscachas (CJimchillidce}, 
celebrated for their beautiliTl soft fur, include Chinchilla (905)? 
Layidium (906), and Lagostomus (904). The Agutis, 
Dasyprocta (940 to 945), and Pacas, Coelogenys (946), represent [CaselOff, 
the Dasyproctidce ; the Cavies, Cavia (934 to 939), to wPich 
belong the little animals known as Guinea-pigs, together with the 
Maras, JJolichotis (931 to 933), and the Capybara, Hydrochcerus 
eapyhara (947), by far the largest of the living representatives 
of the order, constitute the Caviida\ The Capybara in habits 
is somewhat similar to the Hippopotamus, being thoroughly 
