Elementary text-book of zoology, general part and special part: protozoa to insecta . elementarytextbo00clau Year: 1892 \&^i^ Fio. IGG.—Develo])ment of Sycon raphanus (after Fr. E. Scbulze). a, Kipe ovum. J, Stage with four 8c<,'mentatioii cells, c, Stage of segmentation with sixteen cells, (i, Blastosphere witb 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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