124 MISS G. SWEET ON THE SPERMIDUCAL 
and 11 and enclosed the rosettes. The spermiducal gland was 
of a constant width throughout. 
A third individual resembled the second in every respect, 
except that on one side the spermiducal gland was turned for- 
ward, lying in segment 18 entirely. As will be seen later, this 
differs somewhat from the original description. Around the 
spermiducal duct the body-wall is much thickened owing to the 
presence in it of groups of long unicellular glands, whose ducts 
open in groups on the surface around the male opening. 
31. D. qurEnstanpica * (Fletcher). 
Two pairs of testes and rosettes in segments 10 and 11. 
Sperm-sacs very small in segments 11 and 12 (anteriorly). The 
spermiducal gland is flat in some specimens and well-developed 
(Pl. 14. fig. 11), while in others it appears to be either very small 
and tubular (fig. 12), or absent altogether, as in six specimens 
of thoseexamined. In one of these specimens neither sperm-sacs 
nor testes could be seen, probably pointing to its immature 
condition. The two vasa deferentia, which along their length 
are separated by a short distance, enter the gland-duct quite 
separately at about half its length. 
VIII. AcanrHopRILus. 
32. A. SYDNEYENSIS (Fletcher). 
One pair of rosettes in segment 11. Masses of sperm in 
segments 11 and 12, the first probably representing a sperm- 
reservoir, and the second sperm-sacs. Nothing comparable to a 
testis could be seen. The single vas deferens of each side runs 
back along the edge of the body-wall, and opens mT of 
the spermiducal glands on segment 18. 
The spermiducal glands (sp.g., Pl. 14. fig. 7) are two pairs of 
long, coiled tubular structures, one pair opening to the surface in 
segment 17, and the other in segment 19. Both extend back as far 
as segment 26. The muscular duct of each gland extends from its: 
external opening back through about 13 segments, and then 
passes into the second region which extends through another 33 
segments, while the most distal glandular region is found in the 
last three of these segments. The glands lie near the nerve-cord 
on each side, passing through the ventral opening in the septa 
with the nerve-cord and ventral blood-vessel. 
* Proc. Linn. Soc. N.S. W. vol. iii. (2) p. 1529: Perissogaster queenslandica 
(Fletcher). Beddard, /oc. cit. p. 485. 
