GLANDS OF AUSTRALIAN EARTHWORMS. 139 
the horny layer next the lumen. Two small blood-vessels are seen 
running in from the surface. Zeiss D. oc. (2). 
Wig. 18a. Acanthodrilus sydneyensis. Transverse section through duct of 
18 8. 
18 ¢. 
19. 
20. 
Al 
22. 
23. 
24. 
gland showing nuclei of columnar lining and the circular muscle- 
layer. 
Acanthodrilus sydneyensis. Transverse section through the inter- 
mediate part of gland showing nuclei of columnar cells surrounded 
by short granular cells. 
Acanthodrilus sydneyensis. Oblique section through terminal 
glandular part of gland. A blood-vessel is seen running up one 
side. The irregular gland-cells are shown; the relative depth to 
which they are stained with methylen-blue is shown by the shading. 
Zeiss D. oc. (2). 
Digaster brunneus. Section across lobate gland showing the granular 
gland-cells and the apparently empty cells all with their ducts 
Opening into a verysmall central space without any lining membrane. 
Around the lobule are a number of blood-vessels separating it from 
its neighbours. Zeiss H. oc. (2). 
Megascolex tasmanica. Section across lobule in gland showing the 
gland-cells opening into a much larger lacuna, which is connected 
with one of the five terminations of the gland-duct by means of a 
branch with a single layer of much flattened epithelium cells. The 
cut ends of some of the glandular cell-ducts are seen in the lacuna. 
No blood-vessels were visible, and are probably present in the form 
of sinuses. Zeiss EH. oc. (2). 
Megascolides intermedius. Portion of transverse section through 
region of the spermiducal gland showing portion of wall of 
spermiducal duct cut through, and the mass of unicellular glands 
occupying the ventral surface here, with their ducts opening to the 
surface. The position of the nerve-cord is shown and the muscular 
layers of the body-wall. Zeiss C. oc. (2). 
Diplotrema fragilis. Portion of transverse section showing the rela- 
tions of the spermiducal duct, accessory glands, sete and setal sacs, 
and nerve-cord. The vas deferens has opened two sections anterior 
to this, while the spermiducal gland opens two or three posterior to 
this. The opening of one group of gland-cells is seen cut through 
ata’. Zeiss A. oc. (2). 
Megascolex dorsalis. Transverse section of the accessory glands (a.g. 
and a.'g.') surrounding the opening of the spermiducal gland which 
is seen cut through obliquely. The groups of unicellular ducts are 
clearly seen in the lower portion of the section. Zeiss C. oc. (2). 
Cryptodrilus illawarre. Portion of transverse section showing the 
lower part of the gland, the gland-duct, vas deferens, and the two 
setze in their sacs. Zeiss A. oc. (2). 
10* 
