190 
mu. 7. bue. 
mu. Y. Vv. 
mu. ta. 
mu. tr. 
WT. 2. 
Radial muscles of buccal 
region. 
Median-ventral radial 
muscle. 
Muscle layer of tentacles. 
Transverse muscles of 
the body-wall. 
Nervous tissue. 
Buccal nerve. 
Conical buccal nerve 
(abnormality ). 
Nucleus. 
Remnant of nucleus in 
a degenerating ovum. 
Yolk nucleus. 
Right-dorsal radial 
nerve. 
External band of the 
radial nerve. 
Internal band of the 
radial nerve. 
Nerve to tentacle. 
Right branch of respira- 
tory tree. 
Left-dorsal branch of 
respiratory tree. 
Left-ventral branch of 
respiratory tree. 
Anal papilla. 
pa. gen. 
par. oa. 
sep. 
sng. Tr. 
sng. ta. 
sp cy. 
sp’d. 
sp’go. 
spht. buc. 
sul. 
tbl. mu. 
tis. cow’t. 
tis. cov’t. ex. 
tis. cow. 1. 
va. Sng. 
vs. Pol. 
vt. ex. 
BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Genital papilla. 
Wall of the ovary. 
Connective-tissue parti- 
tion. 
Radial blood sinus. 
Tentacular blood sinus. 
Spermatocyte. 
Spermatid. 
Spermatogonium. 
Buccal sphincter. 
Furrow upon the surface 
of the nerve ring. 
Tubules composed of 
muscle fibers. 
Connective tissue. 
External layer of con- 
nective tissue in, wall 
of respiratory tree. 
Internal layer of same. 
Antimesenterial blood 
vessel of the small in- 
testine. 
Polian vesicle. 
External layer of yolk, 
separated by an intra- 
vitelline membrane 
from 
Internal layer of yolk. 
Zona radiata. 
ee 
Pa 
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