280 
PACIFIC SCIENCE, VoL XIII, July 1959 
BODY LENGTH 
IN MM. 
LENGTH OF TAIL 
SEGMENT (in °/o OF 
TOTAL BODY LENGTH) 
HOOKS 
anterior 
TEETH 
POSTERIC 
TEETH 
Tokioka' s specimens: 
11.3 
24.8 
6 
9 
18 
11.1 
23.4 
5 
7 
12-13 
10.5 
23.9 
6 
9 
16 
9.0 
23.4 
6 
6 
9 
8.9 
24.8 
7 
7 
13 
8.0 
22.5 
6 
5 
8 
Hidas specimens: 
12.3 
22.8 
5 
9 
16 
11.5 
23.0 
6 
24 
11.2 
23.1 
7 
8 
19 
11.1 
24.3 
5 
10 
20 
10.5 
24.7 
7 
8 
14 
Sagitta pseudoserratodentata Tokioka, 1939 
Tail segment 26-28 per cent of total length; hooks 6-7; anterior teeth 5-6; posterior 
teeth 7-12. 
The features of this species are similar to those of S. s. pacifica, except that the seminal ves- 
icles are unarmed, and the anterior edge of the vesicles slopes posterolaterally to a rounded 
point, from which the longer posterior border extends backwards and medially to rejoin the 
body wall. The percentage of the total length that the tail segment occupies is greater for 
specimens of equal size in S. pseudoserratodentata than in S. s. pacifica, and the number of teeth 
is less than in S. s. pacifica (see armature formulae tables) . 
S. pseudoserratodentata seems to be mature at a shorter total length than 5. s. pacifica. 
BODY LENGTH 
IN MM. 
LENGTH OF TAIL 
SEGMENT (in Vo OF 
TOTAL BODY LENGTH) 
HOOKS 
ANTERIOR 
TEETH 
POSTERIOR 
TEETH 
Eastropic specimens: 
7.1 
26.7 
6 
5 
0 
6.8 
26.5 
7 
5 
7 
6.2 
21 A 
6 
6 
12 
Sagitta tenuis = friderici 
5. tenuis Conant, 1896 
5. friderici Ritter-Zahony, 1903 
S. tenuis, Bieri, 1957 
Body firm, translucent. Tail segment 21-26 per cent of total length; hooks 5-8; anterior 
teeth 2-5; posterior teeth 4-9. Anterior fins close to, but not reaching posterior end of ventral 
ganglion. Posterior fins close to, or touching seminal vesicles. Caudal fin reaching seminal 
