The Siberian animal, called by the Russians _jevraschka_, is a kind of marmot, still less than the Canadian monax, the head of which is round, and the snout snubbed. It has no external ears, nor can the auditory passages be seen without turning back the hair. The length of the body, including the head, is not above a foot; the tail, which is scarcely three inches long, is nearly round towards the body, then flat, and truncated towards as extremity. The body is thick, the hair yellow, mixed with grey, and blackish towards the end of the tail. The legs are short, but those before are somewhat longer than those behind. The hind feet have five toes, with five black claws, a little crooked: the fore feet have but four. When these animals are irritated, or when they are surprised, they bite violently, and make a shrill noise like the marmot. They sit upon their hind legs to feed, and carry the food to their mouths with their fore paws. They copulate in spring, and bring forth in summer; commonly five or six at a time. They dig burrows for their winter residence, and the females suckle their young at the bottom of their habitations. Though these animals bear a great resemblance to the marmots, they nevertheless seem to be a different species, for the Poland or Alpine species of marmot are found in the same parts of Siberia, which the inhabitants call _suroks_, and these two species have never been observed to mix together, nor produce an intermediate race. THE JERBOA. Jerboa is a generic name, which is made use of to denote those remarkable animals whose legs are extremely disproportionate; those before being not above one inch long, and those behind two inches one fourth, exactly resembling those of a bird. There are four distinct species, or varieties, in this genus; first, the _tarsier_, which we have already spoken of, and which is certainly a particular species, having five toes on each foot, like those of a monkey. Secondly, the _jerboa_, which has four toes on the fore-feet, and three on those behind. Third, the _alagtaga_, whose feet are formed like those of the jerboa, with this difference, that it has five toes on the fore-feet, and three on the hind, with a spur, that may be considered as a thumb, or fourth toe, much shorter than the others. Fourth, the _daman Israel_, or _lamb of Israel_, which has four toes to the fore feet, and five on those behind, and which may possibly be the same animal that Linnæus has described under the name of _mus longipes_.