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Show 610 DR. E. CRISP ON THE H I P P O P O T A M U S . [May 23, ovale ; they are about | inch apart, and are unfurnished with valves. There is only one superior cava ; this vessel is short, thin, and very capacious, measuring 1£ inch in diameter. The inferior cava is also very capacious ; I had not read the essay of Gratiolet, before alluded to, and unfortunately did not examine its structure. The careful inspection of the muscular band in the cava described by Gratiolet will be very important in the adult animal. The thyroid glands, of an oblong form, are in their usual situation ; they are not connected by an isthmus. Their weight is 325 grains. Lungs.-The lungs, which weigh 81b. 14 oz., present some features of great interest; they are nearly unilobular, each having only a small pointed slip at the upper extremity near to the apex. In considering the structure of the lungs it is necessary to take into account the mode of death by burning, for it is possible that the appearances I am about to describe arose from that cause. On inflating tbe lungs with air I was surprised to find that towards the apices large air-cells existed that would hold a common-sized horse-bean, as seen in the preparation before the Society. They presented no appearance of recent rupture; but whether they are natural, or whether it is an emphysematous condition produced bv the mode of death, future examinations will determine. Another peculiarity in the lungs is their lobular division in mam-parts, as shown in the preparations. The lung-tissue is subdivided into lobules of a somewhat irregular form, about the size of large Barcelona nuts. I have seen a somewhat simibir appearance in the lungs of the Dolphin, Porpoise, and Seal. The bronchial tubes are thick and capacious, their parietes consisting chiefly of unstriped circular muscular fibres. The brain was removed from the skuil piecemeal ; it weighed 10| oz. The eye, on the side towards the earth, was but little injured ; it weighed about 200 grains. In m y next paper I will compare the form, size, and structure of the viscera of the Hippopotamus with those of the members of the pachyderm family and of some other animals. The drawings which I have made of the viscera of the Hippopotamus (see fig. 5, p. 611) will better explain the form and relative size of the various organs. P.S. After the above paper was read, my attention was directed to a short communication by Dr. Peters (in his Naturwisseiischaftliche Reise nach Mossambique, Berlin, 1852, p. 180) "on the Visceral Anatomy of the Hippopotamus." The animal examined bv Dr. Peters was an adult. The four divisions of the stomach are briefly described : the right first stomach was found to be double the length of the left. In a large full-grown animal the estimated length of the intestines is 138 feet. A gall-bladder was found long and flat placed across the pancreas. I refer the reader to this communication. The part of greatest interest, I think, in Dr. Peters's account is the large size of the first stomach. As is well known, the rumen of tbe ruminant is |