DR. J. MURIE ON THE ANATOMY OF THE SEA-LION. 553 
upon the sides of the trachea close behind (below) the cricoid cartilage and immediately 
adjoining the cesophagus. Lach gland is of a narrow elongated form, about 1} inch 
in length, and 0°4 inch wide at its broadest part; it extends from the first to the sixth 
tracheal ring. Anteriorly what may be considered the head or broader end is roundish, 
or well defined ; but posteriorly the gland mingles with the thick layer of yellow elastic 
and fibrous tissue (deep cervical fascia), which encompasses the trachea and connects it 
with the cesophagus as well as with the vessels of the neck. The surface of the thyroid 
body is smooth, and of a yellowish or orange colour; section demonstrates its substance 
to be compact, with only a few vascular channels on its esophageal side. There is no 
fibroid or muscular band representing a levator thyroidez. 
As regards thymus gland, no remnant of this foetal organism was noticed. 
VI. Tue Dicestive System. 
1. Parts and Organs within the Mouth. 
a. The Teeth and Palate——In this male animal the dentition presented the normal 
number accorded to the adult of Otaria, the formula being 
99 
a—s 
3—3 1--l 4—4 
Ve 2—9> C. Te) Pm. oe) M. 1 =si0- 
The hard palate is as usual covered by firm periosteum, and by a lining of mucous 
membrane of a pale tint; but these are only of moderate thickness. ‘The openings of 
the anterior palatine canals are two long slits placed nearly behind the incisor teeth. 
They have an antero-posterior direction 0°15 inch apart in front, and diverge slightly 
from before backwards. The front portion of the palate to as far back as the 
anterior premolars is tolerably smooth. From between the premolars backwards to 
about opposite the hindermost molars, there is a series of transverse ridges. These 
elevations are low, and somewhat flat on their summits. The most of them do not 
traverse entirely the palate from one side to the other, but are irregularly interrupted 
in the median line. Each half slants inwards and backwards in such a manner that if 
continuous they would form a series of low arches, the convexity of which is directed 
backwards. The interspaces or hollows are less than half the breadth of the raised 
portions of membrane; and the median longitudinal one is somewhat wider than the 
transverse ones, especially as it meets these. Behind the teeth the surface of the palate 
is smooth. 
b. Lingual Organ superficially considered.—The tongue in Otaria jubata is a thick 
fleshy body, which dorsally at the root is greatly arched both transversely and longi- 
tudinally, and becomes somewhat flatter towards the narrower anterior bifid extremity. 
Looked at laterally, when it has been removed from the mouth, it presents an elongated 
wedge-shape, with roundish margins. A marked lateral row of large papille defines 
the smooth under surface from the opposite upper roughened dorsum. As seen above, 
