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PACIFIC SCIENCE, Vol. XII, April, 1958 
Fig. 3. Cruise 5, 158° longitude, a, Relationship of total salp volume, total salp numbers, and numbers of 
Thalia democratica to major currents, upwelling, and island masses. Limits of currents, upwelling, and islands are 
approximate, b, Relationship of the other common species, Salpa fusiformis , Kitteriella amboinensis , and Cyclosalpa 
pinnata to major factors listed in a. 
distribution with indications of increased vol- 
umes near the equator, near the current shear 
at the margin of the Counter and North 
Equatorial Currents, and in waters near the 
Hawaiian Islands. Relatively great total num- 
bers and numbers of Thalia democratica were 
taken near the region of upwelling and in 
waters near the Hawaiian Islands. The abun- 
dance of the other species shows little ap- 
parent relation to the ecologic factors being 
considered, but there was a tendency to 
greater numbers in the region of upwelling. 
In regard to the section of cruise 8, 158° 
W. (Fig. 5), the distribution of the volumes 
appears to be random, showing little apparent 
relation to the ecologic factors examined ex- 
cept in one instance (10° N.)> where a rela- 
tively large volume was taken in the region 
of current shear between the margins of the 
Counter and North Equatorial Currents. The 
distribution of total numbers and of numbers 
of the common species also showed little 
