392 CHORDATA. 
laryngeal, a peculiar nerve which, on the right side, loops 
round the subclavian artery and, on the left side, passes 
round the ductus arteriosus. In each case it goes forwards 
beside the trachea to the larynx. 
The sympathetic can be followed as a ganglionated cord 
between the vagus and its depressor branch, and the spiza/ 
accessory and hypoglossal can also be recognised supplying 
certain of the neck-muscles, 
280.—A MEDIAN LONGITUDINAL SECTION THROUGH THE RaBBIT’s BRAIN. 
(Mainly after MARSHALL.) 
Cerebral Hemisphere. 
Middle Commissure. 
Pineal Body. 
sellum. Corpus 
Callosum. 
Fifth 
Ventricle 
ae Se Olfactory 
Lobe. 
Infundibulum. Optic Nerve. Anterior _ 
Foramen of Munro. Commissure. 
Fourth Ventricle. 
The skeleton of the rabbit can be divided, as in preced- 
ing types, into axial and peripheral portions. It consists in 
Skeletal, the adult chiefly of bone and it presents the 
* remarkable feature of eiphyses. An epiphysis 
is a cap of bone which, up to a certain age, can be detached 
from the main portion of the bone as it is united to it 
merely by cartilage. The meaning of these epiphyses will 
be pointed out later (see page 413). 
Skull_—The skull has mainly persistent sutures. The 
characters of the teeth have already been noticed. The 
important mammalian features are the heterodont (incisors, 
