SEXUAL ACTIVITIES OF THE SQUID 417 
PF, pouch on the finishing gland, of unknown function. This pouch is connected 
with the lumen of the finishing gland duct and with the finishing gland it- 
self as a sort of diverticulum. 
PR, point of rupture of the inner membrane. During ejaculation the inner mem- 
brane and the spiral filament separate from the oral end of the cement body, 
As ejaculation proceeds they form the outer covering of the tube through 
which the sperm mass is forced. The extreme outer end of this tube is free 
from them as the middle membrane, which forms the extreme outer end, 
extends along the cement body past the point of rupture. 
S, 18, 19, 20, 21, 22, lines on figure 1 and figure 16 indicating the planes of sections 
of spermatophores represented by figures bearing the same numbers. 
S, 33, 34, 35, 36, lines on figure 29 that indicate the planes of sections of the sper- 
matophoric organ represented by figures bearing the same numbers. 
SD, spermatophorie duct, connecting the finishing gland with the spermato- 
phorie sac. When a spermatophore starts into this duct from the finishing 
gland it is completely formed, except that a slight shrinking, especially in 
the region of the oral end, will still take place. By the time the spermato - 
phoric sac is reached the shrinking is complete. 
SF’, spiral filament. This is fastened to the inner membrane and seems to serve 
to keeping lumen of the ejaculatory apparatus open. The material of 
which it is composed is brittle and the filament is broken into small frag- 
ments as the tubes composing the ejaculatory apparatus are everted. The 
same letters have been used for the filament while the coils are distinct and 
for the broken fragments that remain sticking to the outside of the evagi- 
nated inner membrane. See figure 7. 
SFG, spiral filament groove. The material from which the filament is formed is 
passed along this groove to the forming spermatophore which is passing along 
the groove underneath the ridge across which the spiral filament groove 
cuts. 
“SL, space filled with liquid. This liquid originates in the middle tunic gland. 
It does not stain and evidently has only the double purpose of lubrication 
and transmission of pressure. 
SM, sperm mass. In lettering the same letters have.been used for the mass of 
spermatozoa, whether in position in the spermatophore, during ejaculation, 
or in the sperm reservoir after ejaculation is complete. It should be borne 
in mind that the arrangement is changed so the original sperm mass is dis- 
organized entirely by the time it reaches the sperm reservoir. As the dis- 
organization is a continuous process in ejaculation, it seems more confusing 
to attempt to designate it by different letters and names than to use the 
same letters with this explanation. 
SS, spermatophoric sac. The receptacle in which the completed spermatophores 
are stored. Because of size it is shown only in the figures of cross-sections 
of the spermatophoric organ. It is really not a part of the spermatophoric 
organ, but a storage receptacle. It receives the spermatophores from the 
spermatophoric duct which comes from the finishing gland, and delivers them 
through the penis. 
VD, vas deferens. This plaited tube joins the testis with the spermatophoric 
organ and delivers the completely formed spermatozoa to it. 
