SEXUAL ACTIVITIES OF THE SQUID goo 
where they were held about five or six seconds. The arm was 
then withdrawn and in about five or six seconds more the empty 
cases of the spermatophores passed out of the funnel of the female 
with a respiratory jet of water. These spermatophore cases 
were pretty closely attached to each other by having the tubes of 
their ejaculatory apparatus twisted together. They were re- 
covered and found to be 41 in number. To the cluster were at- 
tached five sperm reservoirs. Examination of the female later 
showed that most of the other reservoirs were attached near the 
end of the oviduct. While the number of spermatophores used 
in an act of copulation varies greatly, the observations that have 
been made, indicate that this may be a little, but not much above 
the average. 
The animals nearly always separate almost immediately after 
the arm is withdrawn. Beside the male which started to eat the 
female, a very few individuals have remained attached for from 
some seconds to nearly a minute after the arm has been with- 
drawn. 
After copulation the female frequently seems considerably fa- 
tigued and may settle to the bottom and rest some minutes before 
becoming active again. I am rather inclined to think that this 
is due to her struggles, for when the female remained quiet, the 
apparent fatigue did not seem so marked. The male does not 
seem greatly affected, but is likely to continue to be very active 
for some time. 
The copulation that leads to the filling of the sperm receptacle 
on the buccal membrane does not seem to be preceded by special 
movements. Although I have observed it several times the ab- 
sence of preparatory movement has left me rather unprepared 
for the observations that must necessarily be made so quickly, 
for in this, as in the other form of copulation, the animals are sel- 
dom in contact more than ten seconds. In the cases I have ob- 
served my attention has been attracted by the sudden dart of one 
squid, the male, from one end of the aquarium directly at another, 
the temale. Before the dart the squid face each other, and are 
separated by thirty centimeters or more. The movement was 
always exceedingly rapid and was probably due in each case to the 
