MONILIGASTER GRANDIS, A. G. B. 343 
GENERATIVE SYsremM. 
This consists of a pair of testes, each testis lying in a sperm- | 
sac, a portion of the wall of which forms the “ ciliated rosette,” 
and is continued as sperm-duct to open into the atrium on 
each side, the prostate glands, a pair of ovaries, a pair of ovi- 
ducts formed by a modification of the septal wall, a pair of 
ovisacs, and a single pair of spermathecz provided with long 
ducts which present special enlargements, copulatory pouches, 
close to their external apertures. 
The testes belong to Segment 1x, the ovaries to Begpient XI, 
the spermathece to Segment vi11. 
Sperm-sacs, Testes, Ciliated Rosettes, Sperm- 
ducts, Atria, and Prostates.—The sperm-sacs are sus- 
pended in Septum 1x-x. Each appears in the adult to pierce 
the septum so that half lies in one segment and half in the 
other, while the septum is attached all round the equator, so 
to speak, of the sac. The sac can be pushed forwards or back- 
wards, carrying the septum along its attachment with it, and 
when this is done, the septum, owing to its contractility, shrinks 
behind or in front of them so that they appear then to lie 
wholly in one segment or the other. Sections of a young 
worm in which the sperm-sacs were just visible to the naked 
eye show the sperm-sac lying in front of, although in contact 
with, Septum r1x-x. The sperm-sac is oval in shape; it con- 
tains the testis, and in the adult, developing spermatozoa, 
while a portion of its wall forms the “ciliated rosette.” The 
cavity is traversed by trabecule which consist of blood-vessels 
with a minute amount of connective tissue and muscle. 
The testis is attached to the inner wall of the sac on the 
ventral side, in front of the “ ciliated rosette.” It is a small, 
white, flattened body, divided up into lobes at its free edge, 
and resembles in structure the testis of other earthworms, 
The sperm-duct joins the sperm-sac just behind the testis, 
but still in front of the equatorial attachment of the septum— 
i. e. in Segment 1x—and its wall spreads out so as to become, 
I think, the walls ofthe sac. The epithelium lining the sperm- 
