414 DOGS AND WOLVES CHAP. 
form of the bulla is Aeluroid. The teeth vary somewhat in 
number, and the following table will serve to indicate the gradual 
reduction observable in the number of molars :— 
a 3: GQ leper. saoues 
Otocyon I3 C+ Pm¢ M274 
Canis generally I$? Ci Pm¢ M32 
= o 4 or 3 
W0)) Sy yd sal d re 2 
Icticyon 1304 Pm# ee or 1 
Y 3 1 > 
All the Dogs have a caecum! of simple cylindrical form. In 
C. cancrivorus, C. jubatus, and Nyctereutes procyonides this organ 
is straight or only very faintly curved; in other Dogs it is 
eolled into an §-like form, sometimes with an additional twist. 
The Dogs have, as a rule, five toes, one being dropped in Lycaon. 
The tail is fairly long and distinctly bushy. There is in a 
number of species a gland at the root of the tail, the presence of 
which can frequently be detected by the wet appearance due to 
the oozing secretion. The great majority of existing Canidae 
belong to the genus Canis. But certainly three, and more 
doubtfully four, other genera can be distinguished. 
The genus J/eficyon contains but one recent species, the Bush 
Dog CL. venaticus, Lund) of British Guiana. The animal has a 
somewhat Paradoxure-hke, at any rate a distinctly un-dog-like, 
aspect, being longish in the body (some 2 feet long), shortish in 
the legs, and big-headed. It is blackish in colour, verging 
towards golden brown on the head and back. Sir W. Flower, to 
whom we owe our chief knowledge of its structure, characterises it 
as like a young Fox, and with the playful manners of a puppy. 
The animal appears to hunt in packs and by scent, and has a 
reputation for ferocity. Jeticyon differs from Canis and agrees 
with the Indian Cuon in having but forty teeth, the last molar 
having disappeared from the upper and lower jaws. ‘The 
caecum, unlike that of the majority of Canidae, is only slightly 
eurved. The brain, oddly enough, shows a Cat-like peculiarity. 
It has been pointed out that in their long bodies and short legs 
the genera Cuon and Ieticyon resemble the primitive dogs.” 
A genus Nyctereutes is usually separated from Canis for the 
inclusion of V. procyonides only. The separation is based upon 
1 Flower, Proc. Zool. Soc. 1879 2 766. 
* Proc. Zool. Soc. 1880, p. 7 
