OBSERVATIONS ON HOTARU-IKA WATASENIA SCINTILLANS 
87 
The i^receding tables clearly show that the male is less in number than 
the female whether it was caught with Fukiibe-aini at night, or with the drag- 
net during the day, or obtained from the stomach of fish. 
From the preceding pages we get the following data: i) the number of 
spermatophores comprised in a fully extended Needham's sac is about 73 (see 
p. 84) ; this number may be reckoned as the total sum of the spermatophores 
produced by a male in a year for such an animal finishing its mating in a 
short period, 2) the number of the spermatophores fixed on the nape of the 
female is 14 on an average, for each female has 2 bundles of spermatophores, 
each comprising 7 ones on an average (see pp. 83, 85). If we assume that all 
the spermatophores of the male are entirely fixed into the females, then it is 
necessary at least that there should be one male to about 5 females, considering 
from the above two facts. But Table I on page 86 shows that the ratio of the 
males is less than one against 79 of the females so that there are in the animals 
caught by the Fuknbc-aiui at night, only 1/5 enough males to suffice for 
mating. So too in the specimens obtained either from the deep of the sea or 
from the stomachs of the Tkaagt-a, we get the same tendency in the numeri- 
cal relation of the two sexes. 
Further, there may be some mistake as to the fixation of the spermato- 
phores by the male. Consequently the enumeration of males by the number 
of spermatophores becomes uncertain and many more of them should naturally 
be expected. 
10. Eggs Floating on the Sea- 
The egg is ovoid in shape, being i .5 mm. long and i .2 mm. broad. Those 
obtained between April 19 and May 7, 1913, showed either the segmented 
condition or a further developing stage. The sea condition at the time of the 
surface collection of the egg is as follows : 
