circulation of the blood in the class Vermes , 
9 
EXPLANATION OF THE PLATES. 
Plate I. 
Exhibits a posterior view of the heart, aerating organs, and 
great veins in th^ Sepia officinalis. 
A A. The vena cava anterior. 
BBB. The vense cava? inferiores. 
C. The vena cava media. 
D D D D. Large canals officiating as veins, by receiving the 
blood from the different vena? cava? ; they have appendages 
of a peculiar kind like small grapes, which are hollow, and 
communicate by large orifices with their cavity. These are 
additional reservoirs, but they also secrete something that has 
a yellow tint. 
EE. Two large venal trunks going to the organs of 
aeration. 
FF. Two bulbs, in each of which is a pair of valves to 
prevent regurgitation of the blood from the aerating organs. 
GG. Two small hollow spongy bodies which appear to 
have no direct communication with the bulbs to which they 
are attached. 
H. The great vessel, which from its size I call a vein* 
going to supply the aerating organs. 
I. The corresponding vessel, which from its size I call an 
artery, by which the blood goes from the aerating organs 
to the heart. 
KK. The two auricles of the heart. 
L. The ventricle. 
M. The aorta. 
MDCCCXVII. 
C 
