. Concerning evolution. Evolution. FIGURE NO. 12 YOUNG FORM OF ROSY FEATHER-STAR [Antedon rosacea] Most of the adult feather-stars or sea-lilies (Crinoids) were fixed forms, with the cup and the arms borne on a stalk. The same is true of some of the present-day forms. The common Antedon, however, moves about freely, and can swim by bending its pinnate arms. It is interesting to find that after its free-swimming larval stage is over, the developing Antedon passes through a sedentary phase, here represented. The individual recapitulates racial his- tory. On attaining a certain size the Antedon,
. Concerning evolution. Evolution. FIGURE NO. 12 YOUNG FORM OF ROSY FEATHER-STAR [Antedon rosacea] Most of the adult feather-stars or sea-lilies (Crinoids) were fixed forms, with the cup and the arms borne on a stalk. The same is true of some of the present-day forms. The common Antedon, however, moves about freely, and can swim by bending its pinnate arms. It is interesting to find that after its free-swimming larval stage is over, the developing Antedon passes through a sedentary phase, here represented. The individual recapitulates racial his- tory. On attaining a certain size the Antedon, still very small, drops off the top of the stalk. 88. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Thomson, J. Arthur (John Arthur), 1861-1933; Dwight Harrington Terry Foundation. New Haven, Yale University Press; [etc. , etc. ]
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Keywords: ., bookauthorthomsonjarthurjohnart, bookcentury1900, bookdecade1920
