hepatic and pancreatic secretions enter the duodenum separately, but 

 close together. In the structure of the abdominal ring, the Orang 

 recedes further than the Chimpanzee (Simia Troglodytes, L.) from 

 the human type ; the kidneys also differ, and present, like those of 

 the Monkeys generally, only a single papilla. The palate, unlike 

 that of man and of the Chimpanzee, has no pendulous uvula. 



In external form, the brain resembles the human and that of the 

 Chimpanzee : it differs from the brains of other animals in the num- 

 ber and disposition of the lamina of the cerebellum ; in the posterior 

 fissure of that part ; and in wanting the transverse band of fibres 

 posterior to the pons Varolii. As compared with that of the Chim- 

 panzee, the medulla oblongata is shorter in proportion, as are also 

 the anterior lobes ; and the cerebellum projects further behind the 

 cerebrum. The internal structure of the brain has not yet been 

 examined ; some previous preparation of that part having been 

 deemed necessary, in order to render it sufficiently firm for dis- 

 section. 



The structure of the larynx is minutely described, and contrasted 

 with the anatomy of the same part in the Chimpanzee, in which 

 the laryngeal sacs are not developed as in the Orang. The left 

 laryngeal sac in the present instance was the largest, and extended 

 over the top of the sternum. In the Chimpanzee the laryngeal sac 

 is produced into a cavity in the body of the os hyo'ides, presenting 

 the first indication of the excavation which is carried to so great an 

 extent in the Monkeys of the genus Mycetes. The thyroid gland is 

 small in the Orang. The lungs are entire en each side, and not 

 divided into lobes. The aorta gives off by a common trunk the 

 right subclavian and the right and the left carotid arteries, the 

 latter of which is given off in the Chimpanzee, as in man, from the 

 arch of the aorta. 



In the course of his illustrations of the anatomical differences 

 which exist between the Orang and the Chimpanzee, Mr. Owen 

 frequently referred to Tyson's " Anatomy of a Pigmy," and con- 

 firmed many of the descriptions given in that work. 



