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H. rotula, Gould. (Pre-oc.) Proc. Bost. Soc. 

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HELLICELLID^. 



Syxoxtmy aistd Eeference to 

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HYALINA. 



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" 27. H. Breweri, Newcomb. Proc. Cal. Acad. Nat. 



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" 28. H. VORTEX, Pfeiffer. Arcliiy. fur Naturgesch., 



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