Elementary text-book of zoology . elementarytextbo0101clau Year: 1884 a FIG. 100.—Development of Si/con nijihaiiiit (after Fr. E. Schulze). «, Ripe ovum. 4, Stage with four segmentation cells, c, Stage of segmentation with sixteen cells, d, Blastosphere with large dark granular cells at the open pole, e, Free-swimming larva, one-half of the body (entodermal) being formed of long ciliated cells, the other (ectodermal) of large granular cells.

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