354 



THE VIEWPOINT OF A PHYSIOLOGIST 



stricted by summer evaporation (Johnson, 1952). Oysters (Cras- 

 sostrea virginica) from Virginia, where normal spawning occurs 

 at 25°C, failed to spawn during two years in Long Island 



10 



O 



X 



<x> 



7.0 



5.0 



40 



c2 30 



o i 



o 



> 



cy 



cr 



D 

 O 

 0) 



c 

 o 



c 



1.0 



0.7 



05 



04 



03 



O 

 O 



o 



THAIS EMARGINATA 



ALASKA 



• • 



so CALir. 



-i i i u 



j_ 



_i_ 



_i_ 



_L- 



10 12 14 16 18 



Te m p_ C 



20 



22 



24 



Fig. 4. Growth rates of shell length of veliger larvae of Thais emarginata 

 as a function of temperature for populations horn Mount Edgecombe, 

 Alaska and Big Rock, California. From Dehnel (1955), by permission of 

 University of Chicago Press. 



Sound, where the temperature failed to reach 25°C; yet only 

 adults were transplanted, not spat (Loosanoff and Nomcjko, 

 1951). When spat of another species (Ostrea lurida) were trans- 

 planted from Puget Sound to Long Island Sound, survival and 



