DISCOVERED ON THE COAST OF THE UNITED STATES. 85 
MEASUREMENTS OF THE FOSSIL WALRUS SKULLS. 
Prof. Frazer’s specimen. Mr, Finch’s specimen. 
Greatest length of skull estimated, 0 6 : . 165 inches. 
Length from mastoid ridge to front of canine alveolus, . : 5 UR 
Greatest length of tempero-orbital fossa, . j 0 tae 8 
Leneth of skull from summit of tempero-occipital ridge to end of nose, 10% “ 
Breadth of narrowest portion of cranium, ; : ; Apacoy ops 
Breadth of cranium at mastoid processes, . : c yoy lle 
Breadth of face at canine alveoli, : 3 ; Om 9% inches. 
Height from palatal border to end of nose, . : : 5 Oe 5 GB 
Height of anterior nasal orifice, a: . : 6 ae 2 a 
Breadth @ a G3 Qi of 
Length of exserted portion of tusks, : : : , , 18 @ 
Antero-posterior diameter of tusks at alveoli, : 5 sai Omens’ wee 
Transverse G oc Ob . ‘ : of Ble 1g «é 
Distance of tusks from each other at alveoli, . : : ie Ac’ Be. G 
Distance sf & a tips, : : > 1 
Leneth of inciso-molar series, . ; F ‘ 5 a SS x 
- Distance apart of third molars, ae) G tage 
Distance apart of incisors, . : : : 5 . I lines. 14 lines. 
Antero-posterior diameter of incisors, . : ; . PE a6 14 aS 
Transverse, @ GS : 3 i ; 2 ine Lec 11 a 
Antero-posterior diameter of first molar, : : : aun. eae oa 
Transverse, 06 a GB. ; 5 é SOs -@ 10 @ 
Antero-posterior diameter of succeeding molars, : : ilied 2 nse 13 @ 
Transverse, a as as : é : Sd Alan gh. & 
In the course of the preceding investigations I was led to examine a specimen, in the 
cabinet of the Academy of Natural Sciences, consisting of the stuffed skin of a portion of 
the head enveloping the jaws of a species of Walrus apparently differing from the true 
Trichecus rosmarus, of which, as characteristic, I have viewed the figures of the skull and 
skeletons as given by Daubenton, Cuvier, and De Blainville. The specimen was presented 
by Sandwith Drinker, Esq., of Canton, China, and was probably derived from the Asiatic 
shore of the Arctic Ocean. From the worn condition of the upper incisors and molars, it 
appears to have belonged to an old individual; and in the case of the lower jaw, the teeth 
appear to have been entirely worn out. The tusks are very much longer and are nar- 
rower than in the 7. rosmarus, and they curve downward, outward, and inward, instead 
of continually diverging, as in this species. At their emergence from the alveoli the 
tusks are two and three-quarter inches apart, near their middle five and a quarter inches, 
and at their tips only one inch. Their length is twenty-two inches and their diameter 
