OBSERVATIONS ON IIOTARU-IKA WATASENIA SCINTILLANS. 89 
ii) 4 specimens, — all mature males, donated by Prof. Dr. A. Oka who ob- 
tained them at Hazama-mura, Awa Prov., in the middle of Feb., 1907. The 
mantle-length, 36-42 mm. 
iii) 16 specimens, — all mature males, obtained at Nishimisaki, Awa Prov- 
ince, Feb., 16, 1 89 1. The mantle-length, 36-44 mm. 
iv) 104 specimens, — 37 + $ i/j Odawara, Sagami Province, March 9, 
1907. The males are here also all matured, and the number of spermatophores 
carried by the females is as follows : 
Female 
^~\^specimens 
Characters^^\^^ 
I 
2 
3 
4 
5 
6 
7 
8 
9 
10 
II 
12 
13 
14 
15 
16 
17 
Mantle-length 
in mm. 
37 
39 
395 
40 
40 
40 
41 
41 
41 
41.5 
42 
42 
42 
42.5 
44 
44 
45 
spermatophores ] "S^' 
in nape | j^^^ 
0 
0 
7 
0 
0 5 
7\ 8 
0 
7 
7 
4 
6 
0 

7 
8 
7 
0 1 0 
0 j 0 
0 
5 i 7 1 5 
0 
4 
7 
5 
8 
0 
4 
8 
7 
v) 33 specimens, — 'q, 10 + 23, Odawara , Sagami Province in the middle 
March, 1900. The males are matured, and the females, except only one, carry 
numerous spermatophores. 
A 
vi) 4 specimens, — all mated females, caught by Mr. H. Oshima, at Manazuru, 
Sagami Prov., March 18, 1909. The mantle-length, 45-49 mm. 
The above specimens convince us that on the coast there exist numerous 
males especially in the early fishing season, that diminish in inverse propor- 
tion with the female as the season advances. 
The first females caught do not carry any spermatophores on the nape, 
i. e. are unmated. Such specimens constitute about 35 % of all the females 
in the fourth bottle, and about 3.4 in the fifth bottle, thus the unmated 
females diminish gradually in that ratio ; this seeming to show that all the 
females that come to spawn are unmated at first. So in Suruga Bay the mating 
of this animal probably takes place in early March and the spawing probably 
in April. 
By these differences in the mating and spawning habits of the same animal 
