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Show 684 MR. F. G. PARSONS ON THE [Nov. 20, in the Ground-Porcupines there are practically two left central lobes, a large one externally and a small one internally. I found no gall-bladder in Atherura or in the specimen of Hystrix cristata with which I compared it, but the liver of H. javanica in the Museum of the College of Surgeons shows a very large and somewhat sacculated one. In Erethizon1 the left central lobe is undivided, aud the right lateral is as big as, if not bigger than, the right central. In this specimen also there was no gall-bladder2. The kidneys are smooth on the surface, and on section show several papillae ; the right one is, as usual, in advance of the left. CIRCULATORY AND BESPIRATORY SYSTEMS. The suprarcnals are closely adherent to their respective kidneys. O n section they show a yellow cortex and a red medulla. The thymus is large. Fig. 4. The Lungs from the front. a.l. Azygos lobe. p.v. Pulmonary vein. •p.a. Pulmonary artery. b. Bronchus. The larynx is remarkable for the great size of the cricoid as compared with the thyroid cartilage. The epiglottis is broad and notched ; on its laryngeal surface is a vertical ridge corresponding 1 P. Z. S. 1882, p. 276. 2 Neither is there any in Sphinyurus, |