144 
M. SASAKI. 
Symplectoteuthis luminosa sp. nov. (PI. IV., figs. 7-13). 
Jjocal name : Siiji-ika (Sagami I'rov.) 
Ty/>e. — Three male and seven female specimcn.s, taken six miles off Misa- 
ki cuast, in 700 fathoms, Aug. 5, 1906. Their measurements are as follows : 
t 
0 
S 
t 
0 
Q 
r 
0 
T , 
9 
T 
P 
T 
Q 
T 
0 
t 
Q 
mm. 
mm. 
mm. 
mm. 
mm. 
mm. 
mm. 
mm. 
mm. 
mm. 
Dorsal length of mantle 
143 
154 
166 
120 
122 
141 
151 
151 
155 
157 
Ventral length of mantle 
13S 
151 
191 
116 
120 
139 
147 
148 
151 
155 
Circumference of mantle 
60 
92 
102 
75 
82 
86 
97 
98 
92 
97 
Kreadth of mantle 
31 
33 
35 
24 
28 
28 
32 
33 
33 
33 
Dorsal length of head 
27 
33 
34 
19 
31 
28 
33 
32 
32 
32 
Breadth of head 
30 
34 
34 
23 
28 
28 
32 
31 
32 
30 
Length of fins 
69 
72 
83 
52 
54 
66 
71 
76 
75 
78 
Total breadth of fins 
76 
80 
90 
62 
72 
73 
90 
87 
81 
85 
L. R. 
L. 
R. 
L R. 
L. R. 
L. R. 
L. R. 
I.. R. 
L. R. 
L. R. 
Length of first arm 
46 46 
51 
51 
54 55 
32 31 
— 45 
43 43 
50 
50 
50 50 
50 50 
,. „ second arm 
53 53 
57 
55 
60 59 
36 36 
49 49 
50 50 
54 
54 
57 57 
57 57 
„ „ third arm 
50 50 
55 
55 
56 5f 
35 36 
47 47 
49 49 
54 
53 
55 57 
56 56 
„ „ fourth arm 
48 50 
53 
55 
56 60 
36 36 
47 47 
49 49 
54 
54 
55 55 
57 57 
Length of tentacle 
68 70 
75 
75 
96 96 
60 60 
68 68 
70 70 
S5 
80 
- 63 
100 102 
„ „ club 
32 32 
35 
35 
40 38 
23 23 
32 32 
31 31 
35 
35 
— 32 
38 38 
The body is fleshy and the skin smooth. The mantle is conical, the 
broadest portion being in the anterior margin, and one-tliird of the posterior 
portion is more attenuated than usual. The emargination of the ventral an- 
terior edge and the projection of the dorsal edge are both very slight. The 
fins which do not reach the extreme end of the mantle, are bothtogether rhom- 
boidal, with slightly concave latero-posterior edges, and are notched at the 
anterior attachment (PI. IV, fig. 7). 
The head is as broad as the mantle-opening, with a sharp boundary 
edge posteriorly. The siphonal exca\'ation is deep and acuminate in front, 
being marked by a distinct boundary edge, of which the post-lateral parts 
project forming thick folds which embrance the siphon laterally. At the apex, 
it has a small rhomboidal foveola which has about eight faint longitudinal 
folds within, and outside the faveola, two or three small oblique folds are 
