434 DR. J. MURIE ON THE ANATOMY OF THE WALRUS. 
diminutive, relatively and absolutely, as compared with those in Whales. Moreover he 
pointed out, as has since been noticed by Huxley’, that the epiglottis is very rudimentary 
indeed, though conforming to the Pinnipedian type. In our specimen it is seen to be 
remarkably short, stumpy, and somewhat of a horseshoe-shape ; in fact, when retroverted 
it can scarcely cover the glottidean aperture; but no doubt shrinkage in spirit has 
reduced it, though likewise the neighbouring parts are also contracted. The rima 
glottidis is both narrow and short, and the oblique furrows of moderate depth; in 
figure these clefts resemble those of Ofaria; and, as in that genus, the smooth rounded 
projections formed by the arytenoid and Wrisbergian cartilages are large and pro- 
minent. ‘The upper or external laryngeal pouches appear deepish. 
The bottled preparation does not suffice for a very detailed description of the carti- 
lages of the larynx; but this much is seen:—The thyroid cartilage laterally is upon the 
whole smoother than in Ofaria, oblique ridging being well nigh obsolete. The ale 
thus viewed have a partial hourglass-contour, the lower or cricoid emargination being 
deepest. The inferior or descending cornu is relatively broader and more rounded than 
in the Eared Seal; likewise the pomum Adami has a higher (anterior) position, and the 
conspicuous cartilaginous elongation bounding the upper notch in Ofaria is shorn off, 
or more obliquely rounded, in Trichechus. The front or superficial aspect of the thyroid 
cartilage even more strongly denotes the gradation from Pinnipede to Fissipede Car- 
nivorous type, the upper notch possessing a wide V-shaped outline, the lower notch 
bayed, with rounded angles, and the alar bridge broad and flattish. 
Of the relatively larger cricoid cartilage, the superficial tracheal emargination is 
shallow, wide, and not so angular as in Otaria; the inferior border is more convex, and 
the crico-thyroid smaller, 
According to Professor Huxley, “the rings of the trachea are entire, but many run 
into each other in front and behind.” ‘The same observer says there is an accessory 
trunk to the right bronchus; if present in our specimen it was not noted. The very 
ample and elongate lungs (fig. 19, Pl. LV.) agree with Daubenton’s description; and 
their notched or serrate anterior margin, alluded to by Owen, was partially visible in 
the upper lobes. 
VI. Or tHE Myouoey. 
Having already very fully described and figured the muscles of the Sea-lion (Otaria 
jubata), to which the Walrus is closely allied, as much in its fleshy locomotive structures 
as in other points of taxonomic value, I consider it unnecessary again to descend to all 
particulars. Instead of reiteration, therefore, it may be taken as granted that in the 
muscular system of the two animals there is as close a correspondence as variety in the 
osseous frame admits of. That is to say, excepting the skull, the other bones present 
resemblances; and as the attitudes assumed by both creatures are not unlike, the 
muscles concomitantly are developed after the same type. Once for all, then, it is to 
‘ Hunterian Lectures, reported in ‘ Lancet,’ May 5, 1866, p. 494, 
