RODENT! A-ARVICOLINAE-ARVICOLA RIP ARIA. 
523 
Measurements . 
Inches. 
1.40 
.55 
1.16 
4.40 
5.99 
Tail from root to end of vertebra®.• 
1.75 
2.00 
From long hairs of back to end of vertebrae.'.. ,. 
I£ar&, height, posteriorly.. 
1.45 
anteriorly 
.55 
internally above skull, ... 
,35 
width.,........ 
.42 
length of fore arm .••••<> «• • •«•«••••••• 
.69 
from elbow to end of claws-. • 
1.15 
‘forefoot to end of claws. • ••••■. «««e «••••• •••••••; 
.45 
longest toe and claw.. 
.27 
longest claw... 
.10 
Leg, from knee joint to end of claws,. 
1.56 
.90 
hind foot from heel to end ofolaws. .. 
.80 
longest toe and claw.••••••••• • ••«. 0 •*•«••«••• • 
.32 
longest claw. •••••••••• ••••«» •• •••«•• ••••••••. 
.11 
In giving an account of the skull, I have selected that belonging to the specimen of Major 
Leconte, above referred to, as perhaps serving better for the purpose I have in view than that 
of the animal just described. 
The skull in this specimen (VVV 5 ) is unusually long and narrow; its width, 50| hundredths its 
length, or barely over half. The molars are about 23 hundredths of the total length ; the mea¬ 
surement being: Length of skull, 1.18 inch ; width .60 ; length of molars, 28. The occipital 
foramen is rather broader than high. The cranium projects antero-externally into the inter- 
zygomatic cavity as a well defined obtuse angle. The interparietal hone is long, and is truncated 
on the outer sides, sending out a point to the backward prolongation of the temporal hone. 
The upper incisors are broad ; their cutting edges, taken together, about as long as the crown 
of the anterior upper molar. The anterior surface broad, convex, although, as usual, there is a 
very shallow concavity towards the outer edge. • The last molar is a little longer than the middle 
one. It has three vertical groves on each side. There are three salient angles on the outside, 
besides the C-shaped loop which succeeds those as a long curve, convex externally, and passing 
round to the inner side of the tooth. Here there are three salient angles ; or four, including 
the end of the C ; in fact, the two ends of this curved loop constitute two of the four inner 
salient angles. There are in all five islands of dentine, completely enclosed by loops of enamel; 
one anterior, one posterior, one internal, and two external; all are triangular except the pos¬ 
terior, which is curved as described. 
