282 
PACIFIC SCIENCE, Vol. XIII, July 1959 
Body long, thin, moderately transparent, delicate. Tail segment 30-34 per cent of total 
length; hooks 5-8; teeth 8-12. Lateral fins wide, rounded, often subcircular; extending from 
seminal vesicles over posterior 14 of trunk; widest at level of tail-septum. Collarette and in- 
testinal diverticula absent. Caudal fin touching seminal vesicles. Ovaries with rounded ova. 
BODY LENGTH LENGTH OF TAIL SEGMENT 
IN MM. (in °/o of total BODY LENGTH) 
HOOKS 
TEETH 
Eastropic specimens: 
12.5 
32.0 
7 
11 
10.2 
31.3 
/ 
11 
10.0 
30,0 
8 
12 
Tokiokds specimens: 
11.3 
34.1 
6 
8 
10.6 
32.0 
6 
9 
10.2 
32.4 
5 
9 
9.1 
34.0 
6 
Hidds specimens: 
10.9 
30.0-32.0 
7 
9 
10.4 
31.2 
7 
11 
9.2 
30.5-31.2 7 
Eukrohnia hamata Mobius, 1875 
11 
E. hamata, Michael, 1908, 1911 
Body flaccid, opaque, wide. Single pair of lateral fins extending from behind tail-septum 
to ventral ganglion, not reaching seminal vesicles. Tail-septum 20-26 per cent of total length; 
hooks 8-9; single row of teeth, 6-17 in number. Tips of hooks curved inward. Intestinal 
diverticula absent. Collarette absent. 
BODY LENGTH LENGTH OF TAIL SEGMENT HOOKS TEETH 
IN MM. (in °/o of total BODY LENGTH) 
Eastropic specimens: 
10.7 
23.4 
8 
17 
7.0 
22.9 
8 
6 
Hidds specimens: 
13.9 
21.5 
9 
10 
13.7 
25.5 
9 
9 
13.2 
20.5 
9 
6 
10.7 
23.4 
9 
6 
Pterosagitta draco Krohn, 1853 
Spadella draco, Michael, 1908, 1911 
P. draco, Baldasseroni, 1915; Bieri, 1957 
Body opaque, firm. Tail segment 32-38 per cent of total length; hooks 8-9; anterior teeth 
