epibolyn.

1875 E. R. Lankester in Q. Jrnl. Microsc. Sci. 15 163 Embolé and epibolé are but two extreme forms of one and the same process.

1877 T. H. Huxley Man. Anat. Invertebrated Animals xii. 683 The process of inclusion of the hypoblast within the epiblast may have the appearance of the growth of the latter over the former, or what is termed epiboly.

1887 A. C. Haddon Introd. Study Embryol. ii. 33 The gastrula in the Frog is thus formed partly by invagination (embolé), partly by overgrowth (epibolé).

1897 T. J. Parker & W. A. Haswell Text-bk. Zool. I. iv. 205 The stage has been produced, not by a process of invagination or tucking-in, but by one of epiboly or overgrowth.

1914 E. W. MacBride Text-bk. Embryol. I. viii. 171 The formation of a cap of small ectoderm cells resting on larger endoderm cells and gradually investing the latter by the process called epibole.

1956 K. F. Lagler Freshwater Fishery Biol. (ed. 2) vi. 97 When epiboly is about half completed in the Atlantic salmon, a few pairs of body segments (somites) are already visible.

1875 E. R. Lankester in Q. Jrnl. Microsc. Sci. 15 165 (heading) Epibolic invaginate Planulæ.

1897 T. J. Parker & W. A. Haswell Text-bk. Zool. I. v. 257 The process by which the germinal layers have become formed is..a process of epibolic gastrulation.

1966 McGraw-Hill Encycl. Sci. & Technol. (rev. ed.) VI. 79 In some animals, such as certain coelenterates, no pronounced epibolic or embolic movements of cells seem to occur during gastrulation.