228 NORTHERN ZOOLOGY. 
comparing it with a specimen of the pika; but a scull of the latter, preserved in 
the museum of the College of Surgeons, is twice the size, and differs in form. The 
pika has not only a larger head, but its fur is described as coarse, and its colours 
as dissimilar to those of the Little-Chief Hare. The pika is said, by Pallas, 
to inhabit Kamskatcha; and, by Pennant, to have been discovered on the 
Aleutian Islands, 
The Little-Chief Hare presents differences in its teeth from those of the true 
hares, which fully entitle it to rank in a distinct genus; and it is further entitled 
to that distinction from the naked tubercles at the end of its toes, and its very 
different habits. 
DESCRIPTION, 
Size somewhat less than the Alpine Pika of Siberia ; length 62 inches. 
On comparing the scull of this animal with those of the true hares, there appears a larger 
cavity in proportion to its size for the reception of the brain, The breadth of the scull too 
behind is increased by very large and spongy auditory processes. The bone anterior to the 
orbit is not cribriform as in the hares, although it is thin, and there is no depression of the 
frontal bone between the orbits. 
Dental formula, incisors =, canines %=3, grinders =} = 26. 
Incisors white, anterior upper ones marked with a deep furrow nearer their interior margins, 
and having cutting edges, which present conjointly three well-marked points, the middle one 
of which is common to both teeth, and is shorter than the exterior one. These incisors 
are much thinner than the incisors of a hare, and are scooped out like a gouge behind. 
The small round posterior or accessary upper incisors, have flat summits. The lower 
tmeisors are thinner than those of the hares, and are chamfered away towards their summits 
more in form of a gouge than like the chisel-shaped edge of the incisors of a hare, 
Grinders——The upper grinders are not very dissimilar to those of the hare on the crowns, 
but the transverse plates of enamel are more distinct. They differ in each tooth, having a 
very deep furrow on its inner side, which separates the folds of enamel. ‘This furrow is nearly 
obsolete in the hares, whilst in this Lagomys it is as conspicuous as the separation betwixt 
the teeth. The small posterior grinder which exists in the upper jaw of the adult hares is 
entirely wanting in the different specimens of the little-chief hare which I have examined. 
The lower grinders, from the depth of their lateral grooves, have at first sight a greater 
resemblance to the grinders of animals belonging to the genus arvicola than to those of a 
hare; their crowns exhibit a single series of acute triangles with hollow areas. The first 
grinder has three not very deep grooves on aside, and is not so unlike the corresponding 
tooth of a hare as those which succeed it. 'The second, third and fourth, have each a groove 
in both sides, so deep as nearly to diyide the tooth, and each of their crowns exhibits two 
triangular folds of enamel, The posterior grinder forms only one triangle. 
