The "Voyage of fl.M.S. Challenger." 
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fig? 1-5^ PSAM MAPLI DIU M SPONGIFORME, n..sp 
FIG? 6-7, PSAMMAPLIDIUM E FF R E N ATU M . n. sp. 
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FIG? 8-10, PSAMMAPLIDIUM RETIFORME. r,.sp. 
FIG? 11-13, PSAMMAPLIDIUM FLAV U M . n .sp. 
