149 
generation of the lamprey, the conger eel, &c. 
In the eleventh ring are two protuberances, from which, 
during copulation, two spoon-like suckers are projected, but 
at other times withdrawn. 
At the eighteenth ring begin the longitudinal lateral slits, 
and they are continued to the twenty-second. These are 
shown in an expanded state, in which they are only met 
with at the moment of the coitus. 
In this view the openings from the compartments are dis- 
tinctly seen. On the middle line of the belly are two rows, 
and other two rows on each side ; these last are only distinctly 
seen in this drawing where the crysales are projecting through 
them. 
Plate XIX. The Earth Worm. 
Fig. 1. A testicle and ovarium at the breeding season in 
situ ; magnified twelve times. 
Fig. 2. Ova taken from the ovarium; magnified fifty 
times. 
Fig. 3. One of the membranous bags filled with eggs and 
worms removed from the compartment which contained it ; 
magnified fifteen times. 
a a a. Eggs ready to hatch ; magnified fifty times. 
hbb. Eggs hatching ; magnified fifty times. 
c c. Two embryos hatched. 
Fig. 4. A membranous bag taken from a compartment 
lower down in the worm ; magnified fifteen times. 
a a. Clusters of eggs and embryos agglutinated together ; 
magnified thirty times. 
Fig. 5. a a. The embryo in motion just before going into 
the crysalis state ; magnified thirty times. 
b. The change into the crysalis begun ; magnified thirty 
times. 
