ELEDONE. 559 
probably resemble /”. currosa in its general outlines. As 
in the female, the genital gland is situated posterior to 
the alimentary canal, at the extreme end of the visceral 
dome. It is rounded in shape and opens to the exterior 
by :—(1L) T'wo coelomic canals, right and left, which open 
anteriorly into the testes (Text fig. VIIa, W. V. C.); and 
(2) one sexual duct, which is the left, the right being 
atrophied. The hinder portion of this duct is coiled into 
a spiral mass lying on the left antero-dorsal wall of the 
genital gland (Text figs. VIIa and s.). The different 
regions into which it 1s divided when spread out are shown 
in Text fig. VIIc. Much of this duct is ciliated internally. 
The part visible from the mantle cavity resembles in 
position and appearance the left oviduct of the female 
Peer, fie. 8, pen.). 
A narrow winding vas deferens leads off the sperma- 
tozoa from the testes (Text fig. VIIc, V.W.), and then 
widens to form the vesicula seminalis. This region and 
the prostate and accessory glands are concerned in the 
formation of the spermatophores, 1.e., they form a tube 
found the spermatozoa (Text fig. VIIc, V. S., Pr.). 
Needham’s sac (Text fig. VIIc, N,); into which the 
spermatophores now pass by a short thin vas efferens, is a 
store, where they are arranged side by side longitudinally, 
to await expulsion through the penis. As in the ovary of 
the female, the ventral wall of the testis is alone 
germinal. 
SPAWNING. 
The eggs examined were spawned by a specimen of 
i. ewrosa in a tank at Plymouth in July, 1903. Since 
the crabs placed in the tank as food for the Eledones 
attacked the ova, only two bunches were saved. The 
ova have not, as yet, been dredged, or taken in the 
