THE GIANT EARTH-WORM OF GIPPSLAND. 
53 
PLATE 3. 
al alimentary canal. 
bv blood-vessel. 
com nerve commissure. 
ct connective tissue. 
dp dorsal pore. 
d bv dorsal blood-vessel. 
ep epithelium lining pharynx. 
g ganglion cells. 
ef giant fibre. 
Ln} nerve branches to prostomial region. 
Ln? nerve branches to lower lip region. 
MUSC CLYC circular muscles. 
mus muscle fibres. 
n nuclei. 
ner ventral nerve cord. 
ne nerve fibres. 
0 mature ovun. 
Oe ORO? OF OB orp 
various stages in the development of ova within the ovary. 
phn nerve supply to walls of pharynx. 
p stiff pseudopodial processes of ccelomic corpuscles, 
sal salivary gland. 
sal d salivary duct. 
sal o opening of salivary gland. 
Sog cerebral ganglia. 
sp sperm-blastophore. 
sperm developed spermatozoa. 
123 early stages in the development of spermatozoa. 
sept septum. 
Fig. 10.—Transverse section through a portion of the pharynx wall, together 
with the attached nephridia, modified into salivary glands (sal.) The wall consists 
of epithelial cells surrounded by a mass of connective tissue and muscle fibres, blood- 
vessels, and nerve fibres. The salivary glands are encased in connective tissue, and 
resemble in structure nephridia, their ducts being intra-cellular. The ducts join 
together (sal. d.), pierce the walls of the pharynx, and open into the latter ; the cells 
of the epithelial lining (sal. 0.), becoming arranged in such a manner as to forma 
spherical body, through whose diameter the duct runs. Amongst the salivary 
glands, are bands of longitudinal muscles (Jong. musc.), beneath the pharynx lie the 
blood-vessels, into which the single ventral vessel (cf. Figs. 8 and 9) divides, and the 
ventral nerve cord. The latter is cut through shortly behind the spot at which it 
