372 
PACIFIC SCIENCE, Vol. XIV, October I960 
from California and A. nortoni from Washing- 
ton. Hosts for these species are a nudibranch, 
Pleurobranchus, for A. hawaiiensis, tectibranchs, 
Navanax and Aplysia, for A. navanacis and A. 
lighti, a pelecypod, Chaceia for A. fit chi, and an 
aspidobranch gastropod Diadora for A. nortoni . 
These findings, added to previous records, in- 
crease the impression that the genus is com- 
posed of species characteristically associated 
with a variety of molluscan hosts. 
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