PLATE XXXVIIIa. 
The Lettering is the 
c. Hypoderm. 
CO. Kemarkable development of basement tissue beneath 
the hypoderm. 
d. Cu’cular muscular coat. 
dv. Dorsal blood-vessel. 
e. Dorsal longitudinal muscles. 
f. Ventral longitudinal muscles. 
fe. Longitudinal band of fibres in median ventral line. 
same in all the Figures. 
g. Oblique muscles. 
j. Alimentary canal. 
j'. Proboscis. 
n. Nerve cords. 
V. Ventral channels. 
vs. Ventral blood-vessel. 
z. Meshes containing yellowish masses like oil 
chcetopterus. 
Fig. 1. Transverse section of the ventral body- wall of Pista abyssicola, 
showing the nerve-area enclosed by the circular muscular coat, 
glandular tissue, ...... 
Fig. 2. Transverse section of the anterior third of the body-wall of Pista 
mirabilis. fe, band of longitudinal muscular fibres inside circu- 
lar coat ; V, vessels around alimentary tract ; 2 , glandular tissue 
apparently in connection with the hypoderm, 
Fig. 3. Transverse section of the anterior third of the body-wall of Pista 
japonica, ....... 
Fig. 4. Transverse section of the anterior third of Terebellides strcemi, var., 
from Kerguelen, je, remarkable apparatus intricately folded. 
The figure has been inverted, ..... 
Fig. 5. Transverse section of the ganglionic region of the nerve-area in 
Dasychone occidentalis. co, modified basement-tissue, . 
Fig. 6. Transverse section of the interganglionic region in the same species. 
CO, modified basement-tissue, ..... 
. Phyllo- 
X 55. 
X 40. 
X 24. 
X 55. 
X 55. 
X 55. 
