120 MISS G. SWEET ON THE SPERMIDUCAL 
denser and more compact portion, which probably represents the 
true testis. The rosettes, though covered with sperm, were not 
seen to be included in the membrane enclosing the testes—though 
in other respects these agree with the sperm-reservoirs of 
Beddard. 
The true sperm-sacs are very compact saccular structures in 
segments 9 (posteriorly) and 12 (anteriorly), and sometimes in 
13 (anteriorly), those in segment 12 being the least saccular of 
the three. 
The spermiducal glands are bilobed, or sometimes merely flat, 
and bifid structures in segment 18, the anterior wall of which 
becomes somewhat pushed out of position. The duct is smail 
and S-shaped, and less muscular than usual. The vasa deferentia 
unite in segment 12 to form one on each side, which enters the 
spermiducal duct as it leaves the gland. 
23. M. iInrErRMeEptIus * (Spencer). 
As in JZ minor, though even to a more marked extent, 
the sperm-reservoirs are developed one on each side in segments 
10 and 11, enclosing masses of developing sperm. The testes 
and rosettes, the latter of which are distinctly ‘‘ Maltese-cross ” 
in shape, are enclosed in the same membrane. In both segments 
each reservoir (cf. fig. 15)is divided off into two parts, the larger 
ventral part enclosing testis and rosette. The septum between 
segments 8 and 9 is lost, being merely represented by a few 
fibrous cords. Occasionally also that between segments 9 and 10 
is absent, in which case the sperm-reservoir of segment 10 is 
lost, the rosette alone being present. The sperm-sac usually 
found on the posterior wall of segment 9 is absent; a pair is 
present in segment 12 (anteriorly). 
The spermiducal gland appears to be generally bilobed, with 
a strongly-marked U-shaped duct, the whole lying in segment 18. 
In one individual the gland on one side was flattened and 
irregular in shape, showing only a slight division into two parts. 
The duct was coiled, and the two vasa deferentia of that side 
opened into the duct a little way from the gland. On the other 
side the gland was absent, and the two vasa deferentia united in 
segment 18 and formed, with the addition of a thick wall of 
muscle-fibres, a duct corresponding in size and position with that 
on the other side. 
* “ Descriptions of Australian Harthworms,” Pt.1. Proc. R. S. Vict. yol. xiii. 
pt. 1. 
