SEXUAL ACTIVITIES OF THE SQUID 415 
EXPLANATION OF FIGURES 
With the exception of figures 32 and 37 to 41, all of the figures were outlined 
with the aid of a camera lucida. Where cut surfaces are shown on spermato- 
phores and spermatophoric organs the relations were worked out by study and 
shown for convenience of those interested in the paper. It is hardly necessary 
to say these were added after the camera-lucida sketches were made. 
The sizes of spermatophores and spermatophorie organs differ with the sizes 
of the individuals from which they were obtained. This explains the differences 
in the size of the figures. The spermatophores were all drawn with the same 
magnification except figures 1, 12, 16, and 17, which are not so highly magnified. 
The sections of the spermatophores shown in figures 18 and 22 were consider- 
ably broken in preparation. While their outlines were obtained with the aid 
of a camera lucida, the damage was repaired by study. The figures are not from 
sections of the same spermatophore. 
Large spermatophores measure 16 mm. in length, but 13 mm.is more common. 
During formation they are larger, but they shrink to their final size after they 
are otherwise fully formed. 
ABBREVIATIONS 
C, cap covering the oral end of the spermatophore. 
C1, constriction separating the mucilaginous gland from the ejaculatory appara- 
tus gland. ‘i 
C2, constriction separating the ejaculatory apparatus gland from the middle 
tunie gland, 
CB, cement body. 
CB', cement liberated by rupture of cement body. 
CC, connecting cylinder between the sperm mass and the cement body. In 
forming specimens the connecting cylinder is continuous with material 
which extends the length of the sperm mass, cement body, and hyaline core. 
In fully formed specimens this material may sometimes be distinguished 
in places. 
CT, cap thread. When this is pulled the cap is normally loosened and the sperm- 
atophore ejaculates. 
EA, ejaculatory apparatus. This term is slightly misleading, as the process of 
ejaculation is not confined to this part. 
EG, ejaculatory apparatus gland. This term is not quite accurate, as other 
portions than the so-called ejaculatory apparatus are formed by this gland. 
F, folds that serve to wind the sperm thread into a spiral. In the position shown 
in figure 34 they are much smaller than they are a little further along in the 
groove. 
FD, finishing gland duct, connecting the finishing gland with the outer tunic 
gland. 
FG, finishing gland. Where the cap and cap thread are formed and where the 
shrinking of the spermatophores is completed. 
(7, groove along which forming spermatophores pass. In some figures the forming 
spermatophores are présent. 
