OBSERVATIONS ON HOTARU-IKA WATASENIA SCINTIIXANS. gg 
so-called Ch6:Inn-ika, which proved to be not the Hotarn-ika but a Sepiolid: 
Iniotcnthis iniotciitliis (Naef). This was really discharging a faint cobaltish 
light from a great luminous organ which is situated in the mantle cavity near 
the ink-bag. 
The fact that on this coast, the Hotaru-ika is not caught, agrees with the 
fact that the amount of the whole catch by the Fiikiibc-anii in the western part 
of Shimminato coast is very small, as well as for the fact that it is rarely 
caught on a shallow coast such as Fushiki, and Ishida of Shimoniikawa-gun 
And it agrees also inversely with the fact that Hotaru-ika are caught in the 
valleys or on the inclined walls bounding the valleys. 
In view of these facts, though the school of Hotaru-ika approaches the 
shallow coast at evening from its dwelling in the daytime, there is some limit 
in its migration and it seems that it either can not, or will not, move so far 
as 2 or 3 miles along a shallow bed such as 30 or 40 fathoms. 
2, Namerikawa Region. 
This region is the coast from Jintsu river eastward to the eastern part of 
Uozu, occupying the central portion of the whole coast of Toyama Prefecture. 
The bed of the coast is very deep, the lOO-F-line reaching very near the 
shore, and the valleys are numerous, especially at Namerikawa-cho, where 
they are so frequent that the boundary of the valley-like inlets shows a zig-zag 
line. The catch in this region is also very great especially at Namerikawa- 
cho, where it reaches generally as much as 70 "/o o^" t^'^s total catch in Toyama 
Prefecture. Of course this amount arises from the profusion of Fnkiibc-auii 
used there, but also because the catch of each individual net is greater than 
that of other regions. And the fishermen at Namerikawa make their living 
mainly by this fishery. 
This region is also divided for convenience's sake into 2 coasts : Nameri- 
kawa coast and Uozu coast. 
a) Namerikazva coast (PI. Ill, fig. 4). This coast is bounded by 2 shoals, 
one of which is off Yuwase and the other off the mouth of the Hayatsuki river, 
Fukube-ami of this coast belong entirely to the kind that has the opening in 
