4 ( J2 PHYSIOLOGICAL 81BE 



AMPHIBIA. 



D. 756. A Mcnutn-uiir/tug lateralls with the brain and .-pinal cord 

 exposed from above. The cord, like that of a fish, extends 

 to the tip of the tail gradually deciva-in^ in -i/.e. It 

 .-hows no appreciable thickening at the points of origin of 

 the limb-nerves. 



D. 757. A Common Toad (Bufo vulyaris) with the hrain and 

 spinal cord exposed from above. The cord is much shortened 

 relative to the vertebral column It rapidlv tapers to form, 

 on a level with the fifth vertebra, a iiluin terminal^ that ex- 

 tend- into the urostyle and is surrounded at its proximal end 

 by a cauda eijuina formed by the posterior nerve-root-. 

 Brachial and crural swellings are distinguishable. >eparated 

 by a short narrower segment of the cord. 



EEPTILIA. 



D. 758. A Monitor Lizard (Varanus indicus) with the brain 

 and spinal cord exposed from the dorsal aspect. The cord 

 is cylindrical and except for the brachial and crural 

 enlargements, is of about equal calibre from its anterior 

 extremity to the root of the tail. From this point to its 

 termination at the tip of the tail it rapidly diminishes in 

 size. The brachial and crural enlargements are of quite 

 moderate dimensions. As in all other cases where they 

 occur, they are mainly duo to an enlargement of the ventral 

 horns of grey matter, occasioned by the increased motor 

 nerve-supply necessary for the limbs. The cord completely 



fills the neural canal. 0. C. 134 ( J A. 



D. 759. The spinal cord of some large Reptile, apparently a 

 Snake, -bowing the gradual diminution of the cord to its 

 caudal extremity. There are no indications of brachial or 

 crural enlargement-. 0. C. 1351. //unlcrian. 



D. 760. The, tail of a Python (/'//////*. sp.) showing the -pinal 

 cord /'// sit ii from above. A- in I'drnmi.*, the cord exlrnds 

 to the tip of the tail gradually diminishing in si/.e. It fills 

 the cavity of the neural canal. O. ( '. L'549 B. 



