364 MR. OWEN ON THE GENERATION OF THE MARSUPIAL ANIMALS. 



g. The acute fold of the ileum, at the end of which the umbilical vesicle was 



attached. 

 h. The elongated caecum. 

 i. The large intestine. 

 k. The supra-renal glands. 

 /, /. The kidneys. 

 m. The ureters. 

 n, n. The testes. 

 0, o. Epididymis. 

 p, p. Vas deferens. 

 Fig. 9. The brain and spinal chord of the same foetus, from the superior or dorsal 



aspect. Natural size. 

 Fig. 10. The same, from the inferior or ventral aspect. 

 Fig. 11. Superior view of the same brain. Magnified three diameters. 

 Fig. 12. Side view of the same. Magnified three diameters. 

 The following letters signify the same parts in each figure : 

 a. Spinal chord. 



h. Medulla oblongata. * 



c. Cerebellum. 

 d, e. The medullary mass, from which the bigeminal bodies are developed. The 

 separation of the ganglions, termed Testes d. Nates e, is faintly visible. 

 /. Posterior striated bodies. 

 g. Cerebral hemispheres. 

 h. Crura cerebri. 



i. (Fig. 11.) The ventricle of the right hemisphere laid open. 

 k. (Fig. 10.) Mammillary body. 



The state of development of the brain of this mammary foetus corresponds 

 to that of the human foetus at the ninth week. 

 Fig. 13. The head of a mammary foetus of a Kangaroo, about eight weeks old, 

 dissected, to show the relation of the larynx to the tongue and posterior 

 nares. 



a. The epiglottis, drawn down out of the aperture in the soft palate. 



b. The cavity in the tongue for the reception of the nipple. 



Fig. 14. The elongated nipple, withdrawn from the mouth : the dotted line shows 

 the extent to which it is grasped ; it never extends into the oesophagus or 

 stomach as has been conjectured. 



