. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. JACKSON: STATUS OF BOTHRIOCTDARIS 497 4, figs. 2, 3). The same developing structure of the interambulacrum is shown by Bather (1918, 1920) in PhoUdocidaris anceps (Austin). This development of the interambulacrum as indicated by the progressive addition of columns is directly parallel and comparable to the develop- ment of the ambulacra, marked also by the addition of columns passing adapically in certain Palaeozoic types as seen especially in the Palae- echinidae (Phylogeny, p. 229-232). Largely ignoring all that has
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. JACKSON: STATUS OF BOTHRIOCTDARIS 497 4, figs. 2, 3). The same developing structure of the interambulacrum is shown by Bather (1918, 1920) in PhoUdocidaris anceps (Austin). This development of the interambulacrum as indicated by the progressive addition of columns is directly parallel and comparable to the develop- ment of the ambulacra, marked also by the addition of columns passing adapically in certain Palaeozoic types as seen especially in the Palae- echinidae (Phylogeny, p. 229-232). Largely ignoring all that has been shown as regards the development of the interamliulacrum in Palaeozoic and later types, Mortensen says (p. 107): " if the monoserial condition of the Echinoid interambulacra really were the primitive condition, distinct signs thereof would exist in the young stages of the skeletal de^'; I agree with him. 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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