General principles of zoology . \ FIG. 9>—Discoidal cleavage of the egg of a Cephalopod (Lol/go Pealii.) (After Watase.) 4. Superficial Cleavage.—The yolk is collected in thecentre of the egg and prevents cleavage; in consequenceof this, only the outer layer of the egg divides into cleavagecells, which, in the form of a continuous superficial layer,enclose the unsegmented central mass (centrolecithal eggs)(Fig. 100). A B.

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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1896