250 



VEETEBRATA: PISCES OR FISHES. 



which are concave at each end, and the cavities which thus 

 occur between the vertebrae are filled by a soft membra- 



FIG. 290. 



Skeleton of a Fi^h Perch. 



FIG. 2E1. 



FIG. 292. 



mo. 



Brain of a Cod. 



og, ollactory ganglia ; eft, cere- 

 bral hemispheres ; ol, optic 

 Four vertebra of a Fish; on three a portion of the Iobes 5 c > cerebellum; mo, me- 

 sicle is cut away to show the cavity between ihe dulla oblongata. 

 vertebrae. 



nous and gelatinous substance, which extends from one 

 cavity to another, through a bole with which each verte- 

 bra is pierced. The spinal column bends Math perfect 

 freedom laterally, but not in a vertical direction ; and it 



