MAMMALS OF MINNESOTA. 233 
ANATOMY OF SOFT PARTS. 
The stomach is roundish, curved, partially constricted into 
two compartments of which the pyloric is most muscular. The 
coecum of the intestine is large. 
There are ten teats in Lepus. 
The external ear varies in size and form with the species, 
but the following description of that of Z. campestris will serve 
to illustrate its peculiarities: 
It is in this species of immense size, being 74 inches long 
from the base to tip. The essential parts to be distinguished 
are the cartilage which gives it its form, the muscles and the 
dermal covering. The ears are densely furred without 
and half way down within and are thus well protected from 
the severity of the rigorous climate in winter. The cartilage 
itself is papery toward the tip but below becomes somewhat 
thicker. ‘The general form may be described as spoon-shaped, 
the lower } being the hollow handle, this part is tubular and 
forms the opening into the internalear. Aside from the nearly 
straight canal formed by the upper part of the tube are two 
semi-cylindrical cavities, one on either side. The anterior of 
these is the pars anteriorhelicis which consists of two parts, 
the anterior being a blind sac ~ in. deep—the fossa conchze— 
the posterior a groove separated from the meatus by a small 
spina helicis anterior. A much larger spina helicis posterior 
separates the other part of the helix which occupies the opposite 
side of the ear; this groove opens into the external meatus 
below. At the bottom of the slit which forms the opening 
of the external ear is a lobate slit called the incisura intertra- 
gica which separates two concave lips which represent the 
_tragus and antitragus. The upper part of the ear or scapha is 
less concave and is well furred. The scutulum is the large 
cartilage at the base which slides over the top of the skull and 
furnishes insertion and origin for many muscles which move 
the ear; it is inch long. 
Lepus campestris BACHMAN. 
PRAIRIE HARE. 
Fig. 17. 
BIBLIOGRAPHY. 
Lepus variabilis LEwis, Barton’s Med. and Phys. Journ., ii, 1806, 159. 
GODMAN, Am. Nat. Hist., ii, 1826, 69. 
Lepus virginianus, var.? HARLAN, Fauna Amer., 1825, 310. 
Lepus virginianus RICHARDSON, Faun. Bor. Am., i, 1829, 224. 
ie MAXIMILIAN, Riese, i, 1839, 508. 
