es are known, one
from Costa Rica and the other from Ecuador respectively, named _B.
gabbi_ and _B. alleni_. They much resemble the kinkajou in external
appearance, but the skull and teeth are more like those of _Procyon_
and _Nasua_. In the coatis, _Nasua_, the dentition is as in _Procyon_,
but the upper canines are larger and more strongly compressed, and the
molars smaller; while the facial portion of the skull is more
elongated and narrow. Vertebrae: C. 7, D. 14, L. 6, S. 3, Ca. 22-23.
Body elongated and rather compressed. Nose prolonged into a somewhat
upturned, obliquely-truncated, mobile snout. Tail long,
non-prehensile, tapering and ringed. Coatis, or coati-mundis, live in
small troops of eight to twenty, are chiefly arboreal, and feed on
fruits, young birds, eggs, insects, &c. The two best-known species are
_N. narica_ of Mexico and Central America, and _N. rufa_ of South
America from Surinam to Paraguay (see COATI).

In the kinkajou (q.v.), an animal long known as _Cercoleptes
caudivolvulus_, but whose designation it has been proposed to change
to the unclassical _Potos flavus_, the dentition is i. 3/3, c. 1/1, p.
3/3, m. 2/2 = 36. Molars with low flat crowns, very obscurely
tuberculated. Skull short and rounded, with flat upper surface.
Vertebrae: C. 7, D. 14, L. 6, S. 3, Ca. 26-28. Clavicles present, but
in a very rudimentary condition. Head broad and round. Ears short.
Body long and musteline. Limbs short. Tail long, tapering and
prehensile. Fur short and soft. Tongue long and very extensile.

Weasel tribe.

The last existing family of the land Carnivora is that typified by the
martens and weasels, and hence known as the _Mustelidae_. The group is
characterized by the absence of an alisphenoid canal in the skull, the
reduction of the molars to 1/2 or even 1/1, the medium size of the
sectorial tooth in each jaw, the absence or presence of a perforation
in the humerus, and the presence of anal glands. The family is
cosmopolitan in distribution, with the exception of Australasia and
Madagascar.

The first section of the family, forming the subfamily _Mustelinae_,
is typically characterized by the short and partially webbed toes,
furnished with short, compressed, sharp, curved and often partially
retractile claws. The upper molar is always of moderate size and
elongated in the transverse direction. In the martens and sables
(_M