GLANDS OF AUSTRALIAN EARTHWORMS. aly/ 
is formed by the union of two ducts, one from each lobe. The 
two vasa deferentia of each side unite in segment 13 to form 
one, which is larger in proportion than usual. This enters the 
spermiducal duct just at the union of its two main branches. 
16. M. Firipert * (Spencer). 
A pair of rosettes,in segment 11 are seen to be enclosed within 
a large membranous sac, in which, however, there was no indica- 
tion of a testis. 
Sperm-sacs in segment 12 are mushroom-shaped, and attached 
to the anterior wall by a definite stalk. In two specimens 
examined each sac was found to be filled with Gregarines. 
The spermiducal glands are situated in segments 17 and 18; 
they are bilobed, one lobe in each segment (fig. 14). Occasionally 
a tendency to division into three lobes was seen in the larger and 
bifid character of the posterior lobe. The anterior is usually the 
smaller, and is often only united to the posterior one at the base 
by the branches of the gland-duct; while in other individuals 
again the gland is merely bifid, and confined to one segment. 
The surface of this gland, as in J. Frenchi, is divided up into 
numerous polygonal areas. The gland-duct is well marked, 
almost straight, and strongly muscular. As it passes down 
towards the ventral surface it curves slightly and enters a large 
hyaline muscular bulbus (fig. 14), within which the duct makes 
a double U-loop. The single vas deferens enters the muscular 
sac, and runs backwards and then alongside and behind the 
spermiducal duct, curving with it. The vas deferens joins the 
duct just after the latter has finally curved, to pass vertically 
downward to the external opening on segment 18. From its 
appearance, this last part of the spermiducal duct is probably 
protrusible. In one specimen, in which there was no prostate 
on one side, the vas deferens of that side simply ran straight to the 
surface in segment 18 without any increase of muscular fibres. 
17. M. rasmantcoa f (Spencer). 
Two pairs of testes and rosettes in segments 10 and 11. The 
testes are large and finger-like. 
Sperm-sacs in segments 9 (posteriorly) and 12 (anteriorly). 
Spermiducal glands distinctly bilobed in segments 17 and 18; 
one lobe in each segment. In some individuals polygonal areas 
* Proc. R.S. Vict. 1892, p.19: Pericheta Fielderi (Spencer). Beddard, doc. 
+ Ibid. 1894, p. 47: Pericheta tasmanica (Spencer). 
