“I 
cn 
STRUCTURE OF TURTLES. ] 
heat, which is so considerable that our internal temperature 
constantly maintains itself at the height of 98° F. 
Smaller Circulation, Through the Lungs. 
Polmonary-s-==—-——— Pulmonary 
Artery. Veins. 
Right Auricle:=---<-= ns on g ee ) Oy \-i-------------Left Auricle. 
Rishteenenwee sees / 
Veutricle 2 2 ye \7 77> > Left Ventricle. 
: ao RLearte 
Vena cava ____f = eee 
Arteries con- 
veyir.g aérated 
_or scarlet. blood 
from the heart, 
Veins convey- 
ing dull purple 
blood to the 
heart 
Greater Sireulations Through the Body. 
Theoretic Representation of the Circulation m 
Mammals and Birds. 
But the turtle’s heart is differently formed, consisting, as the 
annexed theoretic representation shows, of but one ventricle and 
two auricles, so that a mixed, or only half aérated blood circulates 
: B 
Right Auricle------~ Beem =| (Wfias ea Left Auricie. 
f_. NCSL Nee 
Single Ventricle"--~75 ee zoe Nea Hearts 
Venez carve--- 
t rteries. 
Veins. Arteries 
Theoretic Representation of the Circulation in Reptiles. 
throughout the body, which naturally produces a torpidity of the 
whole vital process. Besides, the lungs of the reptiles are inca- 
