90 M. SASAKI. 
but living on the opposite sides of the Empire I am convinced that these dif- 
ferent modes of reproduction are in reality a single and continuous process ; this 
means that passing through such a habitual progress in Sagami Bay, the 
animal arrives at the condition of its life at Namerikawa and vicinity. 
The fact that only unmated females come to spawn naturally means that 
those once mated never come. This seems to confirm my ojDinion that they 
probably die as the summer passes (see p. 82). The male probably dies after 
the fixing of spermatophores in the nape of the female, and the few lately matur- 
ed ones are caught in company with the female in Fuknbe-avii in April and 
May. 
II. HABITS OBSERVED FROM THE FISHERY POINT OF VIEW. 
Methods of hivestigation. — The statistics of the annual catch were deriv- 
ed from the daily notes of fishing of the persons who are carrying on the Hotaru- 
ika fishery, also from information given by the fishermen who were directly 
doing the fishing. The maps of the fishing places with their depth were 
made according to the following method : 
i) Maps published at the Hydrographie Office, Naval Bureau, as follows : 
a) Main part of Japan and Korea. 
b) Tsuruga Wan to Niigata Ko. 
c) Noto Peninsula. 
d) Fushiki and Yuwase Anchorage. 
The isobathymic lines and coast-lines in this paper are mainly dependent 
upon the preceding maps, their details being referred to the maps and to notes 
of the fishing places, according to which fishermen fix the nets, as well as upon 
the soundings taken by myself. 
ii) Maps of the fishing places used for Fishery Legislation in the Toyama 
Prefectural Office. 
The situations of Fukiibe-ami in the maps contained in this paper are 
drawn from these maps, some corrections being made through the kindness 
