[95] Prodromo, 1768.
[96] Philipeaux, Comptes rendus de l’Acad. des sciences de l’Institut de France, Année 1866, 1867.
[97] Todd (Quarterly Journal of Science, Literature, and Arts, Vol. XVI), Blumenbach, Treviranus, Von Siebold.
[98] How the tentacles could have gotten into their normal position is not explained.
[99] The foot sometimes pushes out through one of the slits made by the bristle instead of out of the mouth.
[100] I have given elsewhere (The International Monthly, March, 1901) a fuller treatment of the gastræa theory from the historical point of view.
[101] It may be pointed out that there may be really several kinds of homology, such as homology due to similar origin of the blastomeres, or to their position, or to their fate, etc. The confusion that has arisen may in part result from the attempt to make homologous parts agree in all points.
[102] That is, one not depending on inheritance through adult forms.
[103] Biologisches Centralblatt, XV, ’95.
[104] A small amount of embryonic mesenchyme may come from some of the ectodermal quartettes of the embryo and produce the branching muscles of the head, but not the characteristic muscles of the trunk.