SEAL-EMBRYOS8. 13 
appeared to arise in common with this extensor and was inserted into the fascia 
covering the dorsal surface of the carpus. 
I am omitting any account of the muscles of the hinder extremity, as the limbs 
were so rigidly fixed in the older specimens and the muscles in such a brittle condition 
that any data which could be obtained seem to me to be unreliable. The facts related 
with regard to the muscles of the anterior extremity are, I believe, so far as stated, 
trustworthy. 
A consideration of these facts tends towards certain conclusions :— . 
(i.) The muscles as a whole show a closer agreement with the muscles of Trichechus 
than with those of Otaria, There are one or two exceptions (¢g. Flexor brevis 
digitorum, Extensor ossis metacarpi pollicis), but the general tendency is as just stated. 
(ii.) Mivart’s suggestion of a Lutrine origin for the Phocide seems to receive 
some additional support, the muscles as a whole agreeing rather more closely 
with the accounts given by Drs. Parsons and Windle of the myology of Lutra than 
with that of other terrestrial Carnivores. 
ALIMENTARY SYSTEM. 
The upper lip, which is cleft in the middle line, carries six rows of stiff 
elongated vibrissee on either side. The tongue also is cleft at the tip, though in 
the later embryonic stages the fissure is relatively not so deep. The lingual papillee 
do not become distinctly visible to the naked eye until the latter part of foetal life, 
and even in the oldest specimens the anterior third of the dorsum of the tongue 
appears to be destitute of them. On the posterior two-thirds of the dorsum filiform 
papillae are distinctly visible, being arranged in fairly regular transverse rows, where 
they are so closely set as to give rise to the appearance of almost continuous 
ridges with a slightly backward inclination. At the root of the tongue, in the 
region of the foramen cecum, there is a group of well-marked fungiform and 
circumvallate papillee. 
The faucial region is much constricted, allowing only a small passage into the 
cesophagus. Neither the anterior nor posterior pillars of the fauces are evident, nor is 
any uvula present. Qn each side of the fauces is a patch of follicular-looking tissue, 
which probably represents the tonsil. 
The teeth have not erupted in any of the specimens. The dental formula of 
Weddell’s Seal agrees with that of the other members of the sub-family Monachine, 
. .2—-2 1-1 4—4 l=1 
Vi4,t5 pepo pPrragr poy 
jaw are relatively small, the outer ones being considerably larger and more caniniform 
in shape. There is no diastema between the incisors. Between the outer incisor and 
the canine there is an interval, but none between the canine and first premolar. 
Passing towards the posterior end of the jaw, the intervals between the cheek teeth 
= 32. The median incisors in the upper 
