50 ON THE ANATOMY OF MEGASCOLIDES AUSTRALIS, 
septa are shown cup-shaped anteriorly. The first one bounds the 5th seoment, and 
no septa are present in front of this. For the sake of clearness, the anterior septa 
have not been represented in their real thickness. The nerve cord is shown (1.) with 
the cerebral ganglia (spg.) 
Fig. 4.—A diagrammatic longitudinal horizontal section of the anterior part of 
the body to show the blood-vessels and the reproductive organs. The latter are 
shown as in Fig. 3. In addition, in segment 12, is the extra testis (¢.”), sometimes 
present. The dorsal blood-vessel gives off in the posterior part two lateral vessels on 
each side, supplying the walls of the itestine; and in front of, and including the 
13th segment, only one, which runs round the intestine to the ventral vessel. Each 
of these forms a “heart.” 
PLATE 2. 
al ... alimentary canal. 
al bv ... lateral blood-vessel to walls of alimentary canal. 
al’ bu ... blood-vessel on dorsal wall of alimentary canal. 
b ... basement membrane layer beneath cells of epidermis. 
br c ... brown cells. 
bv ... blood-vessel. 
circ m ... layer of circular muscle fibres. 
ct ... connective tissue. 
cut Pepecuuicle: 
d bv ... dorsal blood-vessel. 
dv ... diverticulum of the tube enclosing the dorsal blood-vessel. 
dv o ... opening of diverticulum into tube. 
ep ... ecelomic epithelium. 
ept ... epidermis. 
ep* ... epithelium of alimentary canal. 
gl ... gland cells of clitellum. 
gob ... modified gland cells of epidermis (Fig. 7), and of epithelium 
of alimentary canal (Fig. 5.) 
gob n ... nucleus of modified gland cell. 
glo ... opening of gland cell of clitellum. 
h ... lateral blood-vessel modified into heart. 
lat bv ... blood-vessel running by the side of the alimentary canal. 
long m ... layer of longitudinal muscle fibres. 
m neph ... muscle cells at external opening of nephridial duct. 
neph ... nephridial duct. 
n ... nuclei scattered in the basement membrane (Fig. 7.) 
