SEXUAL ACTIVITIES OF THE SQUID 405 
quite different it will be convenient to refer to them by different 
names. 
The first part (figs. 29 and 32, HG) is slightly swollen and in 
it are formed the membranes of the ejaculatory apparatus. I 
therefore call it the ejaculatory apparatus gland. It is true 
that one of the membranes, the inner tunic, continues over the 
sperm mass so this portion actually forms more than the ejacula- 
tory apparatus, but this term answers very well. The remaining 
portion (figs. 29 and 32, MTG) forms the middle tunic and will 
be called the middle tunic gland. 
The sperm mass and cement body enter the ejaculatory appa- 
ratus gland, with the hyaline core still being formed in the mucil- 
aginous gland, and moves slowly through it, receiving the inner 
tunic at the distal end of this gland, near the notch which sepa- 
rates this gland from the middle tunic gland. The material 
secreted by the glandular walls of this portion of the organ is 
moved by the cilia over the edge of the ridge. The slowly 
rotating sperm mass thus has this material wound around it as 
a thin sheet. Parts of the gland between this point and the 
mucilaginous gland are at the same time secreting materials that 
are being wound into other parts. Bear in mind that after the 
cement body leaves the mucilaginous gland, the hyaline core 
continues to be secreted by it. 
The ridge, under the edge of which the sperm mass and cement 
body have passed, has a groove across its convex surface at a 
point about opposite the notch marking the boundary between 
the mucilaginous and the ejaculatory apparatus glands. This 
groove (fig. 32, SFG) is not very deep, but is easily seen in dis- 
sections of spermatophoric organs which have been preserved 
in formalin. It extends diagonally from one side of the ridge 
to the other and, on the side where the forming spermatophore 
passes, is deep enough to join the groove in which it lies. Just 
after the cement body passes its end the material that forms the 
spiral filament passes along this diagonal groove and, because 
of the rotation of the forming spermatophore, is wound around 
the hyaline core. 
Immediately beyond this groove the material for the inner 
membrane is secreted and wound on as a sheet. The inner 
