Eastropic Chaetognatha ■ — SUND 
275 
BODY LENGTH 
LENGTH OF TAIL 
ANTERIOR 
POSTERIOR 
IN MM. 
SEGMENT (in °/o OF 
TOTAL BODY LENGTH) 
HOOKS 
TEETH 
TEETH 
7.2 
26.4 
7 
8 
10 
7.1 
25.4 
7 
7-8 
11 
7.0 
25.7 
7 
6-7 
9 
6.8 
26.4 
7 
6 
9 
Tokiokas specimens: 
7.8 
24.3 
7 
8 
11 
7.5 
22.7-25.2 
7 
13 
10 
7.3 
27.4 
7 
10 
7.2 
26.5 
7 
13 
11 
7.0 
25.8 
7 
6 
4 
Sagitta hexaptera 
d’Orbigny, 
1834 
S. hexaptera, Michael, I9O8, 1911; Baldasseroni, 
1915; Bieri, 1957 
Body large, transparent. Tail segment 15-22 per cent of total length of body; hooks 4-8; 
1-4 anterior teeth; posterior teeth 1-4. Anterior fins widely separated from ventral ganglion; 
narrow and rounded. Posterior fins not joining seminal vesicles. Caudal fin close to, but not 
joining, seminal vesicles. Ovaries narrow, containing round 
of anterior fin when mature. 
' ova, extending to 
posterior end 
BODY LENGTH 
LENGTH OF TAIL 
ANTERIOR 
POSTERIOR 
IN MM. 
SEGMENT (in °/o OF 
TOTAL BODY LENGTH) 
HOOKS 
TEETH 
TEETH 
Eastropic specimens: 
44.5 
15.7 
6 
3 
23.7 
17.8 
7 
3 
4 
19.0 
19.0 
7 
3 
4 
Tokiokas specimens: 
34.8 
19.8 
4 
3 
2 
34.6 
18.8 
2(?) . 
1 
1 
23.5 
21.3 
6 
3 
1 
22.3 
19.3 
7 
4 
2 
14.3 
20.9 
7 
3 
3 
Hidd s specimens: 
36.5 
18.4 
8 
2 
3 
31.4 
18.8 
6 
2 
3 
Sagitta lyra Krohn, 1853 
S. lyra, Michael, I91I; Baldasseroni, 1915; Bieri, 1957 
