Nissan Island Mollusca — Dell 
331 
When the fauna of Nissan is considered in 
relationship to the zoogeography of the Solo- 
mon group, some very distinctive elements 
are seen to be missing. No species of Placo- 
stylus extends as far north, and such character- 
istic genera as Trochomorpha and Dendrotrochus 
are not represented. 
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