282 Anatomy of the Rabbit. 



(c) The floor is formed by a greatly thickened mass of nervous 

 matter, appearing from the interior of the ventricle in the 

 form of two convex ridges. One of these, posterior and 

 medial in position, is the hippocampus. The other is 

 smaller, anterior and lateral in position, and is the corpus 

 striatum. Between the two bodies the pigmented vascular 

 tissue of the chorioid plexus of the lateral ventricle may be 

 made out. 



(d) On the medial wall, the thickened, posterior portion forms 

 the body of the fornix, immediately in front of which is the 

 thinner portion of the wall, described above as the septum 

 pellucidum. 



8. The passage of the olfactory nerves to the ethmoturbinal 

 surfaces may be traced by removing the nasal bones and. working 

 downward toward the cribriform plate, or the remaining portion 

 of the skull containing the nasal region still intact may be divided 

 vertically for a more extended examination of the nasal fossae. 

 The features to be observed are largely those described in con- 

 nection with the skeleton (pp. 138, 151). 



