. East coast marine shells; descriptions of shore mollusks together with many living below tide mark, from Maine to Texas inclusive, especially Florida . Fig. 1 Trochophore stage in Pa- tella, la Foot, lb Ve- lum, Ic Flagellum, Id Postanal cilia, le Mouth of cilia, the ve- lum in front of the mouth) Fig. 2. The velum is an organ of locomo- tion and helps in the dispersal of the specieS; as- sisting the larva to travel long distances. It may be that the Mol- lusks. Annelids, and other organ- isms, which em- ploy the trocho- phore stage, have descended from a common ancestor.

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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectmollusks