ag. er 
ag. J. 
cl. gn. 
CP. sp 
cta. 
en. r 
en' th, 
eth. 
mad. 
No 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
GEROULD. — Caudina, 
C. 
h. 
Nn. v. 
PLATE 
au 
ABBREVIATIONS. 
Circular water canal. 
Radial water canal. 
Ganglionic cell. 
Spheruliferous wandering 
cell. 
Cuticula. 
Radial epineural canal. 
Endothelium. 
Epithelium. 
Hyponeural canal. 
Madreporie body. 
mu. tr. 
NIE 
pa. gen. 
sep. 
sng. Y. 
tbl. mu. 
Transverse muscles of the 
body-wall. 
Nervous tissue. 
External band of the radial 
nerve. 
Internal band of the radial 
nerve. 
Genital papilla. 
Connective-tissue partition. 
Radial haemal vessel. 
'Tubules composed of mus- 
cle fibers. 
Cross section through one of the radial nerves and aecompanying 
vessels, X 360, 
Cross section through the body-wall near the region of the tentaeles. 
x 330. 
Portion of circular water canal with stone canal and madreporic body. 
X 12. 
Oblique view of anterior extremity of the body. X 6. 
Cross section of the body-wall through a radius, showing muscle 
tubules. X 118. 
