18 
Bernard, the bulldog, greyhound, and other races, nor in any of 
the feral or extinct species of the genus examinéd. It appears to 
be associated with an increased size of the brain, and to be an 
adaptation to the vermis of the cerebellum. The expansion of 
the brain is also indicated by the protuberance of the frontal re- 
gion, and the wide separation of the temporal fosse by a smooth 
space on each side of the sagittal suture. This space does not 
exist in the greyhound, but a narrow one is found in the bulldog. 
These characters are important on various grounds, but are here 
mentioned in reference to the species of Synagodus and Dysodus, 
where they reappear. The absence of the second inferior tuber- 
cular molar is also not uncommon in the “ black and tan” terrier. 
I do not see the propriety of retaining the generic name Nycte- 
reutes, Temm. for the Canis procyoninus of Japan. The pecu- 
liarity it presents in the form of the first superior tubercular 
molar, the only one’ on which the genus reposes, I would regard 
as specific only. 
Vulpes. 
I would, with Gill, refer to this genus the species mentioned 
by Gray and others under the generic names Pseudalopex, Fenn- 
ecus, and Leucocyon. The form of the post frontal process cer- 
tainly does not furnish generic characters. 
Urocyon, Baird. 
The peculiar cranial ridges, in which this genus resembles one 
of the extinct genera of Mustelidx, appears to me to be the cha- 
racter which warrants its separation from Vulpes. 
Enhydrocyon, Cope, Bulletin U. 8. Geological Survey, Terrs. v, 56, 1879. 
Two species from the White River beds of Oregon are known. 
Tomarctus, Cope, Ann. Report U. S. Geol. Surv. Terrs. 1873 (74), p. 519. Paleon- 
tological Bulletin, 1873, Aug. 20, 1873. 
One species known from the Loup. Fork beds of Colorado. It 
is uncertain whether this genus has two or three premolars. Should 
it have three it must be compared with the Brachycyon of Filhol. 
But the inferior sectorial tooth of that genus is as yet unknown. 
Speothus, Lund, 1843. Czon, Hodgs. 
One extinct species of this genus was found by Lund in caves 
in Brazil. Another species, Speothus primevus, is now living in 
! According to the figures of Temminck and Schlegel. 
