PACIFIC SCIENCE 
A QUARTERLY DEVOTED TO THE BIOLOGICAL 
AND PHYSICAL SCIENCES OF THE PACIFIC REGION 
VOL. XXII APRIL 1968 NO. 2 
Previous issue published January 17, 1968 
CONTENTS 
PAGE 
The Compatibility and Incompatibility Concept as Related to Trematodes and 
Molluscs. Thomas C. Cheng 141 
The Littoral Sand Budget, Hawaiian Islands. Theodore Chamberlain 16 1 
A Preliminary Phytochemical Survey in the British Solomon Islands. G. C. 
Morrison 184 
Marine Benthic Algae from Howland Island and Baker Island, Central Pacific. 
Roy T . Tsuda and Gavino Trono, Jr 194 
An Account of the Species of the Red Alga Polysiphonia of the Central and West- 
ern Tropical Pacific Ocean. II. Polysiphonia. George J. Hollenberg ....... 198 
The Polychaetous Annelids of the Marshall Islands. Donald J. Reish 208 
The Polliculinids ( Protozoa ) of Ago Bay, Japan, and Their Relation to the 
Epifauna of the Pearl Oyster (Pinctada martensii). Donald C. Matthews . . 232 
T he Occurrence of Cyclops kolensis Lilljeborg ( Copepoda , Cyclopoida) in North 
America. Edward B. Reed 251 
Considerations Regarding the Evolution of Haivaiian Animals. William A. 
Gosline 267 
Pacific Science is published quarterly by the University of Hawaii Press, in January, 
April, July, and October. Subscription prices: institutional, $10.00 a year, single copy, 
$3.00; individual, $5.00 a year, single copy, $1.25. Check or money order payable to 
University of Hawaii should be sent to University of Hawaii Press, 535 Ward Avenue, 
Honolulu, Hawaii 96814, U. S. A. Printed by Heffernan Press Inc., 35 New Street, 
Worcester, Massachusetts 01605. 
