Eastropic Chaetognatha — SUND 
281 
vesicles. Ovaries similar in appearance to those of S. enflata. Collarette present but extremely 
small; often missing in damaged specimens. Intestinal diverticula absent. Teeth wide-based, 
tapering sharply to a point; tips widely separated. 
BODY LENGTH LENGTH OF TAIL ANTERIOR POSTERIOR 
IN MM. SEGMENT (iN °/o OF HOOKS TEETH TEETH 
TOTAL BODY LENGTH) 
Tokiokas specimens: 
10.3 
22.8 
8 
5 
9 
9.4 
21.6 
8 
4 
9 
7.3 
20.6 
8 
4.7 
23.7 
6 
3 
4 
3.9 
25.6 
5 
2 
4 
The formulae for 5. tenuis =friderici identified from the Eastropic material have been omitted 
because the specimens were in such poor condition that accurate measurements could not be 
made. The specimens for which the formulae are given above were labelled by Tokioka as 
S. friderici. The status of the two species is still doubtful, especially concerning specimens 
from Pacific waters (Tokioka, 1955). The specimens so far identified from the Eastropic ma- 
terial were immature and in poor condition and provide no basis for a discussion of the validity 
of this species at this time. Bieri (1957) gives the impression that the two are synonymous, 
but his final interpretations must await the publication of his findings. 
Krohnitta pacifica Aida, 1897 
K. pacifica, Bieri, 1957 
Body moderately firm, translucent-to-opaque. Single pair of lateral fins long and tapering; 
fins extend anteriorly from seminal vesicles over posterior V3 of trunk; widest behind septum. 
Collarette present, extending as narrow band from neck to anterior edge of fins. Tail segment 
28-38 per cent of total length; hooks 6-9; teeth 7-15. Lateral and caudal fins joining seminal 
vesicles. Ovaries with cuboidal ova. Intestinal diverticula absent. 
BODY LENGTH LENGTH OF TAIL SEGMENT HOOKS TEETH 
IN MM. (in °/o of total BODY LENGTH) 
Eastropic specimens: 
7.2 
31.9 
7 
11 
6.8 
33.8 
7 
13 
6.6 
31.8-31.9 
7 
13 
6.4 
35.9-37.5 
7 
14-15 
6.3 
30.1 
7 
12 
has specimens: 
7.1 
28.1 
9 
12 
7.0 
28.6 
9 
12 
4.2 
31.0 
6 
7-8 
Krohnitta subtilis Grassi, 1883 
Eukrohnia suhtilis, Michael, I9O8, I9II 
