626 
BULLETIN OF THE BUREAU OF FISHERIES 
be a stage of Bucephalus haimeanus. Largely because of this resemblance, the scal- 
lop parasite is considered a Gasterostome. The herring gull is suggested as a prob- 
able higher host species. 
For conservation, which is by legal regulation of the fishery, it is important to 
know that the spawning season, beginning in the summer, and largely autumnal, 
extends into early winter, and that sexual maturity and marketable size are attained 
in a year. A closed season should begin in the spring before the young become 
marketable and extend to early winter. If restrictive measures are to be supple- 
mented by active measures, as in some form of scallop culture, it is important to know 
that scallops ordinarily shift little and that certain areas produce larger and more 
valuable scallops, and that, therefore, such areas if depleted might well be stocked 
from areas which produce inferior scallops. The quickness with which scallops die 
out of water offers special difficulties to the planter. On the other hand rapid growth, 
early maturity, and high value offer special inducement. 
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