circulation of the blood in the class Vermes. 1 1 
aaa. The great artery running from the tail to the head. 
bbb. The nerve which lies upon it. 
cccc. The external organs of aeration. 
dddd. The blood vessels which I call arteries, that bring 
the blood from the aerating organs to the artery; under these 
are seen the veins which convey the blood to these organs. 
steee. Five very vascular bodies, probably answering the 
purpose of a liver. - 
f. The oesophagus. 
g. The stomach. 
hh. Two bags that communicate by small apertures with 
the stomach. 
ii. The intestine laid bare, but not opened into. 
кк. The two auricles lying upon the intestine just where 
it begins to swell out, one on each side. 
II. The two lateral veins that supply the auricles. 
mm. Ova distinctly ascertained to be such. 
Fig. 3. The skin longitudinally divided on the belly of the 
animal, and turned back so as to expose the parts immedi- 
ately under it. 
ааа. The vein corresponding to the artery on the opposite 
side. 
bb. The termination of the two auricles in this vein, by in- 
fundibular vessels. 
cccc. The vessels or venal branches going to the organs 
of aeration. 
eeee. f g, hh, ii, mm, the same as in the last figure. 
Fig. 4. A representation of the arteries in the Lumbricus 
terrestris. 
The animal is laid open by a longitudinal incision through 
C 2 
