. Cassell's natural history. Animals; Animal behavior. LPPER SlUriCE or BRAIN OF OT\BIA [Aflcr Millie.) short and simple-faiiged, tlie ciiniues themselves, or, as they are more comnionl} teimed lu tin tusks, being of inordinate length and strength. In the Otariida^, the lanines, tliouij good size, are small in comparison with those of the Morse tribe, while the incisors and single-rooted molai-s are more conical and prominent. The dentition of the Phocid;e ^•aries considerably, in some the occasionally double-rooted niolare acquiring a tuberculate, in others a saw-like oi' serrate character, w
. Cassell's natural history. Animals; Animal behavior. LPPER SlUriCE or BRAIN OF OT\BIA [Aflcr Millie.) short and simple-faiiged, tlie ciiniues themselves, or, as they are more comnionl} teimed lu tin tusks, being of inordinate length and strength. In the Otariida^, the lanines, tliouij good size, are small in comparison with those of the Morse tribe, while the incisors and single-rooted molai-s are more conical and prominent. The dentition of the Phocid;e ^•aries considerably, in some the occasionally double-rooted niolare acquiring a tuberculate, in others a saw-like oi' serrate character, while the incisors are notch-crowned. The bony cavity for the eye is open behind; the facial legion less prominently produced than in some of the feline C'arnivora. The region of the brain-pan Ls relatively full, while the skull, as a whole, is elongated and flat. In youth, the cranium of the Pinnipedia has a predominating brain area, and the entire bony surface is smooth and featureless. As age advances, however, in certain of the genera at least, the relation of parts changes, and the acquires prominence, while great bony crests arise on the summit and back of the head. The tongue does not possess the spines met with in the Cat tribe, though the surface is roughish. In the Seals, but not in the Walrus, the tip slightly cleft. The stomach is single-chambered. The in- testine is considerably longer than in the Felid», averaging fifteen times the length of the body, or thereabouts. The glands of the internal coat in some of the tribe are very exten- sive, and co-ordinate with the excessively rapid digestion. A curious point in connection with the veins entering the liver is their enormous dilatation. This, by some writers, has been regarded as the means whereby the animal is enabled to remain submerged, the blood being held in these reservoii-s instead of passing on towards the heart and lungs to be aerated. But whether this peculiar disposition of the blood-vesse
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Keywords: ., bookcentury1800, bookdecade1890, booksubjecta, booksubjectanimals
