THE OCTODONE TRIBE. 155 
THE OcTODONT TRIBE. 
Family OCTODONTID&: 
As there is no collective English name for the various members of this 
extensive family, we are compelled to adopt a modification of its Latin title. 
These Rodents are more or less rat-like animals, characterised by having complete 
collar-bones, and their molars marked by enamel-folds on both sides. In the skull 
the jugal portion of the cheek-arch nearly always has an angle on its lower edge. 
The feet, which are armed with long curved claws, generally have five toes. The 
teats are placed high up on the sides of the body; the ears are short and but 
thinly haired; while the tail, which varies greatly in length, may be either clothed 
with short hair, or scaly. With the exception of a few African forms, and others 
from the West Indies, this family is characteristic of South America. 
THE GUNDI. 
Genus Ctenodactylus. 
One of the most remarkable of the African representatives of the family is 
the gundi (Ctenodactylus guid) from the regions bordering the Sahara, character- 
ised by the two inner toes of the hind-feet being furnished with a horny comb and 
bristles, which are employed in cleaning the fur. In size this animal may be 
compared to a water-vole, with relatively long hind-legs. It has no premolar 
teeth, the feet have only four toes each, the ears are small, and the tail is reduced 
to a mere stump. The gundi inhabits rocky districts, and is diurnal; its mode of 
life being very similar to that of the jerboas. 
In Somaliland the gundi is replaced by a closely allied species, 
known as Pectinator spekei, distinguished by its moderately long and 
bushy tail, and the presence of a small premolar tooth in each jaw. 
Pectinator. 
THE Dercu. 
Genus Octodon. 
The degu (0. degus), which is the typical representative of the family, is a species 
inhabiting Chili and Peru, and distinguished from the last group by the feet having 
five toes, without any comb-like appendages, in the hind-limb. The molar teeth are 
alike in both jaws, and are simply indented on both sides by the folds of enamel. 
In general form the degu is like a rat, and it is slightly inferior in size to the water- 
vole; the length of the head and body varying from 7} to 8 inches, while the tail, 
exclusive of the tuft at the end, measures about 4 inches. The fur is remarkable 
for its softness, the ears are of moderate size, and the nearly naked tail terminates 
in a distinct tuft. The general colour of the fur on the upper-parts is brownish 
yellow, mottled with black, while the under-parts are yellowish, and the feet white ; 
the tail is dusky above and whitish below, with the hair at the tip blackish. 
