118 MISS G. SWEET ON THE SPERMIDUCAL 
were visible on the surface. The spermiducal duct is large 
though not always very long, and is muscular. It receives one 
main branch from each lobe, the main duct lying in and opening 
on segment 18. The vasa deferentia, two on each side, are very 
large in proportion to the size of the animal. They run close 
side by side just embedded in the body-wall until, in segment 12, 
those on the right side unite, while those on the left do not 
unite till seement 14. They enter the spermiducal duct close to 
the union of the branches from the two lobes. 
18. M. Hoeerr* (Spencer). 
Two pairs of testes and rosettes in segments 10 and 11. 
Sperm-sacs in usual positions in segments 9 and 12. 
Spermiducal gland in segment 18, bilobed and small ; the surface 
appears smooth, without any markings. The duct is straight, or 
may be slightly curved, and is strongly muscular. The vasa 
deferentia, two on each side, enter the spermiducal duct close 
side by side, at about half its length. 
19. M. Denpyi t (Spencer). 
Two pairs of testes and rosettes in segments 10 and 11. 
Sperm-sacs in segments 9 (posteriorly) and 12 (anteriorly). 
Spermiducal glands in segments 18 and 19, may be flattened 
with but the smallest indication of a second lobe, or they may be 
clearly divided into two lobes (fig. 9). The surface of the gland is 
sometimes very much grooved, though notin any regular fashion, 
and having no relation to internal structure. The duct is single, 
i. e. it does not branch outside the gland-substance; it is long 
and curved into almost an S-shape in some cases, and at others 
forming three or four loops. The two vasa deferentia of each 
side remain quite distinct and enter the spermiducal duct side by 
side, just where it leaves the gland. 
20. M. porsatis t (Fletcher). 
Two pairs of testes and rosettes in segments 10 and 11, both 
testes and rosettes being very large. 
* Proc. B.S. Vict. 1892, p.6: Pericheta Hoggii (Spencer). Beddard, loc. cit, 
p- 379. 
+ Ibid. p.12: Pericheta Dendyi (Spencer). \ Beddard, Joc. cit. p. 380. 
+ Proc. Linn, Soc. N.S. W. vol. ii, 1887, p. 618: Pericheta dorsalis 
(Fletcher). Beddard, doc. ci¢. p. 376. 
