This gland, which emits an aromatic odour, is found in all Canidae, with possibly the exception of Lycaon pictus.
Amongst mammals, we see it strikingly displayed in Bats, and in a lesser degree in the Felidae and Canidae.
The relationship between the Canidae and the Procyonidae must not be lost sight of in considering this point of external likeness.
The skull in the Creodonta is in most respects allied to that of the Canidae, but presents some ursine affinities.
The caecum, unlike that of the majority of Canidae, is only slightly curved.
