SEXUAL ACTIVITIES OF THE SQUID 329 
females that are nearly ready to deposit their eggs. In the large 
number of trials made it was found that the eggs of these individ- 
uals were so nearly mature they could be artificially fertilized. 
Females that are nearly ready to deposit eggs have the nidamental 
glands considerably swollen and the accessory nidamental glands 
are highly colored with bright red. Wherever the spermatophores 
were inserted in the mantle chamber these glands were in this con- 
dition. 
Before copulation both female and male are usually especially 
active and may be known as sexually excited animals by their 
peculiar movements. ‘The female in swimming seems to be ner- 
vous or excited. She throws short but rapid puffs of water from 
the funnel, moves the tail fin very rapidly and, leaving the arms 
quite limp, spreads them apart and frequently throws them to one 
side. This gives the arms a jerky or trembling motion not showa 
in ordinary swimming. Except during the most rapid movements 
of the female, the male solemnly swims by her side, an inch or two 
away, but parallel, and with his head in the same direction. He 
frequently manipulates his arms, spreading them apart, commonly 
with the two dorsal arms elevated nearly or quite to a perpendic- 
ular position, and the third arms spread far to the sides (fig. 3). 
This position is not infrequently accompanied by localized activ- 
ity of chromatophores. A spot may appear near the base of each 
third arm and a smaller spot on each second arm a little further 
from its base. These spots do not remain continuously while 
the male is in this attitude but suddenly appear with each increase 
of activity on the part of either the male or female. Occasion- 
ally blushing is quite general over the head and anterior end of the 
body and sometimes includes the whole body but the bodies of 
both animals generally remain colorless except for the special 
spots mentioned on the male. The attitude of the male, with ele- 
vated and spread arms, is not continuous but is assumed every 
few minutes, or in some cases seconds, and the arms may be brought 
into the usual position of a swimming animal for periods of many 
minutes. 
Males do not allrespond equally tothe presence of sexually active 
females. Not uncommonly one male in an aquarium containing 
