Genus EURYOTIS.— Brants. 
Mammalia. — Plate XXV. 
1 a 
1 b 
1 c 
1 d 
1 e 
1 / 
1 9 
1 h 
2 a 
2 b 
2c 
2 d 
2 e 
2 / 
2 g 
A view of the upper surface of the skull of Euryotis irroratus of the natural size. 
A lateral view of the skull of do - do 
A lateral view of the lower jaw of do - do< 
A front view of the incisor teeth of the upper j aw of do. do. 
A front view of the incisor teeth of the lower jaw of do. do. 
The teeth of the right side of the upper jaw of do, of three times their natural size. 
«. The first or anterior tooth ; b. second or middle tooth ; d. third or hind-tooth. 
The teeth of the left side of the lower jaw of do. do. 
a The first or anterior tooth ; b. second or middle tooth ; d. third or hind-tooth. 
The skull is long and rather narrow, its length, from the anterior extremities of the ojsa^tothe 
hinder aspect of the occipital bone, one inch seven and a half lines ; its breadth immedia e y 
the zigomatic arches eight lines. The frontal bones between and in front of the eyes are narrower 
than in the other species ; five and a half lines in length. The nasal bones increase suddenly 
width towards their anterior extremities, the increase giving rise to a lateral bulge on each side, 
which commences about half way between their two extremities ; length of each bone nine me . 
The molar teeth are six in each jaw, three oil each side, and have true fangs; tieu crowns are n 
sected bv narrow, slightly prominent transverse ridges of enamel, which are separate rom e 
other by' intervening grooves. The first or anterior tooth of the upper jaw has — ridges ; the 
second two ; the third six, and a small elevated enamel ring w hich forms the hind-pomt. I he 
first tooth of the lower jaw Is the longest, and its crown is crossed by four ridges ; the second an 
third each by two. The incisors of the upper jaw are stroug, and slightly arched, their points cu - 
ting; each is marked anteriorly, with a deep longitudinal groove near its outer edge. 'Where t e 
groove terminates there is a slight emargination, in consequence the tip of each tooth appears 
more or less bifid. The incisors of the lower jaw slightly arched forwards, and their points bifid and 
cutting ; the anterior surface of each tooth with a deep longitudinal groove near its outer edge. 
The ccecum, &c., of Euryotis irroratus. 
a. The small intestines ; b. the large ; c. the apical portion of ctrcum, without cells. 
A view of the upper surface of the skull of Euryotis unisulcatus of the natural size. 
do. 
do. 
do. 
do. 
do. 
do. 
A lateral view of the skull of do. 
A lateral view of the lower jaw of do. 
A front view of the incisor teeth of the upper jaw of do. 
A front view of the incisor teeth of the lower jaw of do. 
The teeth of the right side of the upper jaw of do. 
a The first or anterior tooth ; b. second or middle tooth ; d. third or hind-tooth. 
The teeth of the left side of the lower jaw of do. 
. T he first or anterior tooth ; b. second or middle tooth ; d. third or hind-tooth. 
T nth of the skull from the anterior extremities of the nasal bones to the hinder aspect of occipi- 
. , i )one one in ch five lines; width at the hinder extremities of zigomatic arches seven and a 
L if lines The breadth of th e frontal bones, between and before the eyes rather greater than in 
f irroratus • length six and a half lines ; the length of the nasal bones seven and a half lines, 
I T ’n crease a little in width towards their anterior extremities, but there is not that sudden 
*"? H “w-d i« to cocespondiDg bone. of B. .V— ■ The htst teeth 
hu i» .to. -a divided l,v ihtoe distinct tansvetse ridges oi.nemel ; the seeond 
