198 
ON THE LEMURID^. 
abundant in certain gum-forests in the great desert of Sahara, where they are 
captured for the sake of their flesh. 
In the development of the organs of hearing, and in the acuteness of this sense, 
we trace an analogy between the Galagos and the Bats. A vast expanse of naked 
sensitive membrane, with reduplicatures, adding do the extent of surface sur 
rounding the auditory aperture, is in many of the Bats a most conspicuous 
feature, and one which, in conjunction with their delicate wings, abundantly 
supplied with nerves, appears to give them an additional sense, a power of feeling, 
by the motion or quiescence of the molecules of the atmospheric air, the pre¬ 
sence of contiguous objects, so that they are capable of directing their course, 
without striking against them, even when^ deprived of sight. In the Galagos 
the external auditory membranes are in a like state of development and nervous 
sensibility, a condition rendering them susceptible of the slightest vibrations of 
the air, and in all probability alive to sounds inaudible to animals in general. 
Hence, perhaps, one reason why they must be folded during repose. 
According to Adanson, the Galagos build a nest in trees, of fibres and twigs, 
in which to bring forth their young. In captivity they are said to be timid and 
gentle, and to feed indifferently upon meat, preparations of milk, and eggs. ' 
Two well-ascertained species are all with which we are acquainted. 1st, the 
Senegal Galago ( Galago Senegahnsis^ Geoff.). —Colour ashy brown; the ears 
as long as the head, and naked ; the tail longer than the body, and pencil-tufted 
at the extremity. Fur soft, full and woolly. Size of a Squirrel. Habitat? 
Senegal. In Mus. Zool. Soc. 
2nd. The Great Galago ( Galago crassicaudatus^ Geoff.). —Fur rufous grey ; 
ears somewhat shorter than the head; tail tufted. Size of a Rabbit. We have 
never seen a specimen. The genus Galago of Geoffhoy is synon^mious with 
Otoliaius of Illiger. 
Genus Tarsius.—Generic characters. —Incisors above 4, of which the two 
middle are closely approximated, and longer than the lateral ones, appearing like 
canines. Incisors below 2, and canine-like, being conical and pointed. Canines 
above smaller than the two central incisors; those below of moderate size and 
pointed. Molars-^^-g ? according to Geoffroy. Arms long and slender; the 
fingers also much attenuated. Posterior extremities of great length; as are the 
fingers, of which the thumb is well developed, with a small triangular nail; the 
index and succeeding finger are both armed with small subulate claws. Head 
round; muzzle very short, and pointed ,* eyes very large, but not so close together 
as in horis ; ears large, naked, and capable of being folded. Tail long, covered 
with short hear, except at the tip, which is tufted. Fur full and soft. 
In the structure of the Tarsiers we see the peculiarities, as regards the limbs, 
carried to a still higher point of development than in the Galagos, to which 
