APPENDIX. J17 



tcrior pan of the diaphragm, somewhat higher 



than the kidney ; the hit i^ M >wer d 



by the side of the aorta, between it and 

 kidney. Tl icy are composed substances; 



the external having the <! libra Of 



towards tlie eentre; the internal seeming 

 more uniform, and not having so much of the 

 fibrous appearance. 



The blood of animals of this order is, I believe, 

 similar to that of quadrupeds ; hut I have an idem 

 that the red globules are in largci tion. I 



will not pretend to determine Im :his may 



axsi>t in keeping up the animal heat ; but as these 

 animals may be said to live in a very cold climate 

 or atmosphere, and such as readily carries offlieat 

 from the body, they may want some help of this 

 kind. 



It is certain that the quantity of blood in this 

 tribe and in the Seal is comparati\ _jcr than 



in the quadruped, and therefore probably amounts 

 to more than that of any other known animal. 



This tribe differs from fish in having the 

 blood carried to the extreme parts of the b 

 similar to the quadruped. 



The cavity of the thorax is compose! of 

 the >ame | .: IN as in the quadruped: but there ap- 

 be some difference, and the varieties in 

 the different genera are greater. 



The general cavity is divided ii . as in 



the quadruped, by the heart and mediastinum. 



The heart in this tribe, and in the Seal, is pro- 

 bably larger in proportion to their site than in the 



