PLATE IX. — continued. 
6. — 6th pair of oral appendages. 
7. — Auxiliary spikes, situated beneath the mouth. 
a. — Encephalic masses of the nervous system. 
b. — Conglomeration of eyes. 
c. — Ocellus detached from the principal organs of vision. 
d. — Ventral chain of nervous ganglia. 
e. — Pro vent riculus. 
f — Gizzard. 
g. — Slender canal leading from the gizzard to 
h. — Ventricular portion of alimentary canal. 
i. — Pylorus and insertion of 
k. — Hepatic csecal tubes. 
l. — Small intestine. 
m. — Large intestine. 
n. — Anal aperture. 
o— Air-vesicles, subsequently converted into O' dorsal respiratory tubes, 
and 
p. — Tracheal system. 
q. — Dorsal vessel, to the different compartments of which are appended 
r. — Nervous ganglia of the heart. 
s. — Rudimentary ovaries. 
t. — Nerves and ganglionic masses in the muscular walls of the proventri- 
culus. 
