MOLLUSCA 2 
i) 
— 
The spermatophores are complex structures about 2 cm. 
long, they have a receptacle in which the minute spermatozoa 
are stored up, and a long tightly-coiled spiral, thread, the ex- 
pansion of which explodes the capsule, and the spermatozoa 
rush out. 
In the female the ovary occupies the same position as the 
testis in the male; the cavity of both these generative glands 
communicates with the pericardial portion of the coelom, 
though partly shut off from it by a septum. A cushion 
projects into the lumen of the ovary, which bears ova in various 
stages of developement ; from the ovary the oviduct, which is 
ciliated, passes to its external opening to the left of the anus. 
Accessory glands are present ; of these the most important are 
a large pair of nidamental glands, which deposit the substance 
of the egg capsules; in Sepia there is a second smaller pair of 
i 
fi pie ery 
a Vi ‘i am sil 
jet 
NG Wye 
Fic. 129.—a, Male of Argonauta argo, with the hectocotylised arm still contained 
in its enveloping cyst, four times enlarged (after H. Miller). 6, Hectocotylus of 
Tremoctopus violaceus (after Kolliker), 
nidamental glands, as well as the large ones. The egg capsule 
is prolonged into a stalk, by means of which the eggs are kept 
together, and the collection of eggs somewhat nespid tiles a cluster 
at grapes. 
In Sepia one of the arms in the male is slightly modified, 
and probably assists in the deposition of the spermatozoa, but in 
