346 
PACIFIC SCIENCE, Vol. XVIII, July 1964 
in this region: Ritter-Zahony (1911), and 
Schilp (1941). 
E. bathypelagica was represented by only one 
specimen at mid-water trawl 3 (11° 56' S — 
115° 22' E) taken from 2179 m. This single 
record could be considered as a stra!y of the 
population extending along deeper levels. This 
is the first record of the species occurring other 
than in the Pacific Ocean (Alvarino, 1962^). 
This species could not be the spent stage of 
E. hamata, in view of the morphological charac- 
teristics and the size reached at maturity (E. 
bathypelagica 23 mm, and E. hamata 43 mm). 
Sagitta hexaptera is the most common species 
in the region of the Indian Ocean covered by 
the Monsoon Expedition, followed by P. draco, 
S. pacifica, S. ferox, S. bipunctata, and K. subtilis. 
The species appearing in the highest number 
relative to the frequency were, in regressive 
order: S. gazellae, S. bedoti , S. enflata, S. pacifica, 
and S. tasmanica. 
ACKNOWLEDGMENTS 
These studies have been conducted under the 
Marine Life Research Program, the Scripps In- 
stitution’s component of the California Coopera- 
tive Fisheries Investigations, and were supported 
in part by a grant from the National Science 
Foundation (NSFG-19417 ) . 
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