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Show 608 DR. E. CRISP ON THE H I P P O P O T A M U S . [May 23, tion in the right vein. A valve also exists in the vein of the left renal body, near to its exit. The renal bodies (not suprarenal capsules, as they are erroneously called) are of a triangular shape, with a notch at tbe base of each ; the left is placed 2 inches above the kidney; the right is above, but closer to the gland. Each weighs about 240 grains. The weight of the left kidney is 8j oz., that of the right 7 oz. Urinary Bladder.-The urinary bladder is very capacious; it will contain about four quarts of water, and, with the exception of that of the Wart-Hog (Phacochcerus a;liani), is proportionately larger than that of any of the pachyderms I have examined. Organs of Generation.-The testicles small, and within the abdominal cavity ; the vesiculee seminales also small. The penis measured 12^ inches; the extremity is large and globular, like that of the Boars. Its diameter at the end is 2\ inches, whilst in the middle it is only \ inch. A large retractor muscle arises from the os pubis and ischium (as in the ruminants), and is inserted into the left side of the body of the penis 7 inches from its extremity, as seen iu the wax cast. The penis and other parts of the organs of generation were removed by mistake, and therefore I am unable to give a more minute description of thein. Tongue.-The tongue is very thick at it - base, the anterior end broad and round, the surface smooth and velvety ; among the small villi are numerous round light-coloured papillse about the size of a pin's head. The base of the tongue is closely set with long-pointed pear-shaped papillae about j inch in length and 2 lines in width in the centre, differing from those of the Hogs and other pachyderms in their more pointed form. Larynx, Trachea, and Os Hyoides.-The opening of the glottis is somewhat like that of the Dolphin and Porpoise, the parts below t he glottis being of an irregular-shaped pyramidal form ; the thyroid cartilage, however, is placed much higher than in these animals. The laryngeal muscles are very powerful, especially the crico-arytenoidei postici. The os hyoides consists of nine bones-a central nearly circular bone about 1 inch in diameter, and eight separate cylindrical bones (six above and two below) articulated superiorly to the stvloid process of the temporal bone, and below to the thyroid cartilage. The united length of the four lateral bones is 9 inches. As might be supposed from the age of the animal, none of these bones are complete ; and the same remark will apply to the laryngeal cartilages. The thyroid cartilage is of shield-like form, and possesses two cornua above and below. The inferior are about 1 inch in length ; the superior about * inch. The length of the cartilage at its anterior part is 4^ inches. The cricoid cartilage has two large oblong articulating surfaces upon its upper and lateral surface, for the arytenoid cartilages. This cartilage is very thick posteriorly ; its anterior part passes obliquely under the thyroid, forming a pointed ridge in front. It is narrow anteriorly, and about 2 inches deep at its posterior face. The arytenoid cartilages are thick and of an irregular triangular form, the |