Chaetognaths off Peru — Bieri 
259 
Fig. 6. Distribution of Sagitta bedoti in 1941 and 
1952. Crosses with hatchure— present 1952, without 
hatchure-— absent 1952. 
the Pacific is very similar to that of P. draco 
and does not indicate any major change. A 
large form of S. enflata maturing at 20 mm. 
or longer was taken at stations 2, 3, 4, 19, 
and 21. In 1952 this form was also recorded 
from the Peru current. 
The distribution of Sagitta ferox (Fig. 8), 
except for its occurrence at station three, is 
very similar to that of K. pacifica and suggests 
a common origin of the two local popula- 
tions. In 1952 it was missing south of the 
equator except for four stations west of 100 
degrees west longitude. Thus it would appear 
that this species could only have come from 
the north. 
Sagitta hexaptera (Fig. 9) was found in small 
numbers at 12 stations in 1941. Its distribu- 
tion throughout the Pacific is similar to but 
somewhat more widespread than that of P. 
draco and S. enflata\ however, it is not usually 
found as close to shore as S. enflata nor is it 
as abundant. This together with its possibly 
different vertical distribution probably ex- 
plains its patchy appearance in the 1941 
collections. 
Single specimens of Sagitta lyra were taken 
at stations 22, 17, and 14 and ten specimens 
at station 23. This species is found through- 
out the Pacific from approximately 45 degrees 
north to about 45 degrees south latitude. It is 
usually absent from very warm surface waters, 
inhabiting the cooler waters below. Its oc- 
currence at the above stations therefore might 
Fig. 7. Occurrence of Sagitta enflata off Peru in 1941. 
A large form of S. enflata maturing at a length of 20 
mm. or greater occurred at the stations with underlined 
concentrations. 
