DR. J. MURIE ON THE ANATOMY OF THE WALRUS. 433 
the hind quarters are comparatively feeble and less needfully demand large blood- 
supply. No intercostal flexures, as in the Cetacea and Sirenia, were observed. The 
branches usually the product of the celiac axis, and nourishing the stomach, spleen, 
and pancreas, are of considerable capacity, as is the mesenteric. The renal arteries 
diverge nearly at right angles to each other. 
The iliac vessels divaricate at the sacrum almost on a level with the brim of the 
pelvis. The trunk sent into the pelvic basin was not followed; but the femoral passes, 
as in Otaria, beneath the abdominal muscles over the bone above or to the lumbar side 
of the anterior inferior spinous process, below which it reaches the groin. It pierces 
both the adductor longus and magnus; and branchlets are freely distributed to the 
other muscles and the back of the knee. 
On reaching the sole of the foot, to the inner side of the calcaneum the artery, along 
with the veins and nerves, is invested by a strong fascia, and, from what I could see with- 
out unravelling the individual vessels, has a somewhat plexiform arrangement analogous 
to the manus. I could trace, however, a larger-sized vessel (the internal plantar artery ?) 
upon the surface of the deep plantar fascia and the interossei, which split into three or 
four branches; and these ultimately forked in the interdigital spaces. A separate 
external plantar branch ran to the outer side of the fifth digit. 
The arterial channels of the pelvic limb, among other peculiarities, are characterized. 
—1, by their moderate size as compared with those of the thoracic member; 2, the 
abnormal position of the femoral, correlated with the altered condition of the femoral 
region; 3, the manner in which the femoral burrows amongst and pierces the several 
adductor muscles; 4, partial plexiform arrangement in the lower leg and sole; 5, general 
similarity of the plantar to the palmar arch and ultimate digital distribution. 
3. The Larynx and Lungs.—I have given in Pl. LV. three views of parts of the 
larynx and hyoidean regions, and from these shall demonstrate some of the more 
important points of the organ of voice. Having taken out the parts en masse and sent 
them to the College of Surgeons, they were mounted as a preparation before I had the 
opportunity of closely examining them. As, however, they have been carefully dis- 
sected, there is no difficulty in the way of a comparison being rendered between their 
structural condition and that of the Eared and Earless Seals. 
The hyoid bone has been figured and commented on by De Blainyille! and others; 
and as it is not exposed in the preparation, I omit further reference to it. 
In discussing whether the Walrus blows or spouts through its nostrils in the manner 
of Cetaceans, which Martens’ and subsequent writers had averred®, Von Baer‘ very justly 
discards the supposition; and I may remark that the animal gambolling in our large 
tank bore living evidence to the latter truth. He shows that the constitution of the 
parts are entirely at variance with such a function, as the arytenoid cartilages are very 
? «Ostéographie,’ Atlas, tome ii. pl. 10. 2 «Voyage to Spitzbergen,’ 1675. 
* Pennant and Oken, as referred to by Von Baer. * Loe. cit. p. 139. 
