OF THE NEKVUS OCTAVUS. 



23 



(cervical part), and reaches the symphysis along the linea alba over 

 the umbilic (caudo-thoracic part). The plane brought between both 

 lines, divides the animal into two halves, and is the median plane 

 of the body. 



Now, if a normal rabbit is kept swinging free above the ground- 

 plane, its median plane is standing vertically on this ground-plane. 

 The caudo-thoracic and cervical portions of both median lines are 

 running vertically to the ground-plane and are one another's prolon- 

 gation. But their cranial portions, though lying in the same median 



Fig. 9. 



Scheme of tlio medial plane from a normal rabbit, swinging free above a 

 horizontal plane. Seen laterally from the right side. 



plane with the other portions of both lines, are forming with these 

 latter an angle of 90 or even more. Consequently, when viewed in 

 front the median part forms one line. 



But viewed laterally, the median plane of the body appears as 

 is represented in the adjoining figure. The cranial portion of the 

 mid-dorsal line turning caudal ward is looking ventralward, the cra- 

 nial portion of the mid-ventral line turned caudalward, nearly tou- 

 ching the cervical portion of that line. 



Entirely different is the position assumed by the rabbit whose 

 labyrinth has been removed on one side, when kept swinging free 

 in the air, as is shown in photo fig. 13. 



In the caudo-thoracic portion both lines are still running straight 

 upward. The median plane through both lines is standing vertically 

 on the ground-plane, in the same way as with the normal rabbit. 



But at the 7 tu cervical vertebra, in most cases even at more 

 distal vertebrae, another position commences. The cervical portion 



