BREESINSiT Dp UE OF SCIENCE 
21 
ON THE LIFE HISTORY OF AN ECONOMIC CUTTLEFISH OF JAPAN 
the cuttlefish may live is recognized at Nemuro along shore, as inferable from 
the taking of a good catch of the cuttlefish in this water zone, together with 
several fishes proper to warmer waters, such as bonitoes, which sometimes 
make a large part of the product of the fishing villages about the town of 
Nemuro. It can not at present, however, be told with certainty whether this 
body of water is a branch current from the Pacific or the Okhotsk division 
of the warmer water crossing down the Nemuro Canal. In the eastern section 
of the coast of Kitami the population zone of the cuttlefish is also broken off, 
owing either to small fishermen population or to the presence of the Okhotsk 
water of very low temperature, as illustrated by Schrenck. 
Occurrence of the cuttlefish is also very rare along the coasts of Ishikari 
Station 
A B Cc i?) E (62 miles off the coast) 
CASHIZURI (KGCHIN¢cEN) if Fathow 
AN 
CON 
FIG. 9. 
Hydrographic section off Kochi-ken, showing vertical distribution of water temperature on July 25- 
31, 1917 (from a hydrographic observation made by the Fishing Experimental Station of Kochi-ken). 
and Teshiwo, both lying at the western side of Hokkaidé; this is, however, not 
from the influence of the colder water above referred to, but because the littoral 
zone is too shallow for the cuttlefish and also because fishermen are engaging 
in much more profitable pursuits, such as salmon fishing. 
The second current, the Kuro-shiwo, is to be shown also as unfavorable 
for the animal to live in (see again figs. 1 & 6), owing in the main doubtless to 
its high temperature. The southwestern coast of Kiushu, as well as the 
southern coasts of Shikoku (comprising Kéchi-ken and Tokushima-ken), 
Wakayama-ken, and some provinces of Tékaidé like Miyé-ken and Kanagawa- 
ken, all of which the current bathes, afford best illustration of the assertion. 
It is, however, sure that cuttlefish are caught in a certain profitable 
amount wherever water strata of 10°—-17° C. are found on the sea bottom close 
