M. SASAKI. 
pail" arc smaller and much rarer in occurrence than those of all the preceding 
anus, arranged very irregularly. 
Ommastrephes volatilis nov. (PI. IV., figs. i-6) 
Local name : Tobi-ika (Sagami Prov.). 
Type. — (I) One male and female specimens, taken by Mr. K. AoKl off 
Atami, Sagami Prov. on June 24, 1906. 
(II) One male and two feniale specimens, caught by the same collector 
in the same part of the sea on Sept. 23, 1905. According to the information 
of the collector, they flew from the sea into the sky and colliding with the 
.sail of his boat, fell down into it. 
The following table shows the measurements of these five specimens (in 
alcohol). 
No. I 
No. II 
% 
? 
I 
Q 
? 
mm. 
mm. 
mm. 
mm. 
mm. 
Dorsal length of mantle 
208 
152 
148 
148 
Ventral length of mantle 
210 
205 
149 
145 
145 
Circumference of mantle 
98 
93 
75 
82 
73 
Breadth of mantle 
34 
33 
27 
28 
27 
Length of head 
41 
40 
33 
54 
30 
Breadth of head 
35 
34 
28 
26 
Length of fins 
125 
1 1 2 
85 
87 
90 
Total breadth of finss 
100 
75_^ 
82 
_73_ 
left right 
left right 
left right 
left right 
left right 
Length of first arm 
I 10 108 
73 76 
73 73 
70 70 
72 72 
,, ,, second arm 
112 117 
— 99 
- 85 
83 83 
85 85 
,, third arm 
115 114 
109 108 
86 85 
83 83 
85 85 
,, fourth arm 
103 95 
1 00 1 00 
85 85 
S2 82 
75 75 
Length of tentacle 
187 194 
180 180 
215 214 
143 143 
,, ,, club 
60 63 
55 55 
64 68 
50 so 
The body is fleshy, with smooth skin. The mantle is very slender, the 
length being about six times the breadth, and it is conical, the broadest part 
