Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 769
a morula or mulberry-like mass of minute yolk-segments is produced (Fig. 403, A—r),which is converted by ■ invagination into a gastrula (§ 391), whoseform is shown at g. This gastrula soon begins to exhibit a verycurious alternating rotation within the egg, two or three turns * See the Eev. W.…
Microscopy · Biology
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