76 
PACIFIC SCIENCE, Vol. XVIII, January 1964 
S.decipiens 
Fig. 9. Profile Stations 33-43 of the NORPAC CalCOFI Expedition (41° 45' N, 124° 29' W to 38° 35' 
N, 149° 59' W); with the distribution in depth of the mesoplanktonic species in the California waters. 
Notice the offshore sinking of E. hamata. 
46° 44' S— 113° 09' W(December 1957 to Feb- 
ruary 1958). The data from Monsoon Expedition 
covered from 64° 11' S — 165° 56' W and 63° 
05' S— 178° 3T E to 11° 03' N— 142° 28' W 
(February 1961 to April 1961). The data for 
S. gazellae at latitudes higher than 64° S are 
from MacMurdo Sound. The bathymetric distri- 
bution of S. pacifica northward from 20° N was 
obtained by studying records from the Capri- 
corn, NorthPac, Equapac, Transpac, Shellback, 
and Tethys expeditions. 
There is no doubt of the proper identification 
of both species. S. gazellae can be well separated 
from its close relatives (see Alvarino, 1962, and 
references. For S. pacifica see Alvarino, 1961, 
and references). 
S. gazellae extends from the antarctic waters 
to 29° S in the Pacific, spreading farther north 
at mid-depths at stations where S. pacifica was 
also recorded in deeper layers than usual. S. pa- 
cifica, an inhabitant of the upper 100 m in the 
tropical and equatorial Pacific, extending from 
40° N to 20° S, and from here to 35° S, was 
observed at levels below 200 m down to 400 m. 
These two species, one recruited from the trop- 
ical Pacific ( S . pacifica ), and other from the 
antarctic-subantarctic waters (S. gazellae), popu- 
late the upper 100 m in their respective dis- 
LATITUDE NORTH LATITUDE SOUTH 
Fig. 10. Latitudinal bathymetric distribution of S. pacifica and S. gazellae. 
