OBSERVATIONS ON HOTARU-IKA WATASENIA SCINTII.LANS. 
EXPLANATION OF PLATES. 
Plate I. 
I . 
Body color of living female Hotarn-ikci in spring, nat. size. In 
the natural specimen it was a little more reddish in color 
than here painted. 
Fig. 
2. 
Phosphorescence of the same, nat. size. 
Fig. 
3- 
External view of minute organs of mantle of the same, x c. loo. 
Fig. 
4- 
External view of brachial organs of the same, x lO. 
Fig. 
5- 
External view of ocular organs of the same, x 2.5. 
Plate II. 
Fig. 
I. 
Pen of female, x 2. 
Fie. 
2. 
Pen of male, x 2. 
^ 'to* 
J- 
Hectocotylus, x c. 4. 
rig. 
4- 
iviciic, iiaL. size. 
Fig. 
5- 
Pundle of spermatophores fixed in nape of female, x 12. 
Fig. 
6. 
JNape 01 lemaie snowing the same bundle nxcd. 
Fig. 
7- 
hpermatophores from Needham s sac, x 23. A) racket 01 
spermi ; 15) discharging spring; C) connective sheath. 
Fig. 
8. 
bame at the moment when inner organs are moving. 
Fig. 
9- 
Same when the movement of inner organs are completed. 
Fig. 
lO. 
Ventral view of female genital organs, a little magnified. A) 
wpening oi oviauci into ovary j nj oviaucc; iiiaameiuai 
gland. 
Fig. 
1 1. 
Inner surface of nidamental gland showing external opening of 
oviduct. 
Fig. 
I 2. 
Radula, x 80. Mi) Middle teeth; La) lateral teeth; Mr) 
marginal teeth. 
Plate III. 
Fig. 
I. 
Whole coast of Toyama Prefecture. 
Fig. 
2. 
Shimminato coast, x c. i /40,ooo. 
Fig. 
3- 
Yokata coast, do. 
Fig. 
4- 
Namerikawa coast, do. 
Fig. 
5- 
Uozu coast, do. 
Fig. 
6. 
Ikuji region, do. 
