. Dwellers of the sea and shore . meckelia; the ribbon worm, with proboscis partly extruded, new and perfect worm, while the hind body will retain its vitality for days before dying. This division of the body can be accomplished by the animal itself, and it seems sometimes to occur as a natural process. Their tendency toward self-mutilation is so great, in fact, that they cannot easily be handled; they will often separate under the slightest touch. The planarians, a lower group of flat worms, possess the power of regeneration in an even greater degree. When they are divided not

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Keywords: ., bookcentury1900, bookpublishernewyorkt, booksubjectmarineanimals