The American journal of anatomy . J^^ ;X^ /•?ft r^^^ ? ), .? ^ a ???-^SU^^?^^ N. ZP:. , N. EXPLANATION OF FIGURES Fig. 12 A reconstruction of two other adjacent .sections of the same egg shownin the preceding figure. The vacuole about tlie si)erni head is probably an artifactproduced by shrinkage due to an unusually thin cytoplasm surrounding it. Thezona does not appear. X 625. Fig. 13 Two cell stage accompanied by a polar body. Note the presence of aconspicuous zona pellucida. X 750. 172 THE EARLY DEVELOPMENT OF SPELERPESBILINEATUS (GREEN) HUBERT DANA GOODALE ONE PLATE AND SEVENTY-SEVEN TE
The American journal of anatomy . J^^ ;X^ /•?ft r^^^ ? ), .? ^ a ???-^SU^^?^^ N. ZP:. , N. EXPLANATION OF FIGURES Fig. 12 A reconstruction of two other adjacent .sections of the same egg shownin the preceding figure. The vacuole about tlie si)erni head is probably an artifactproduced by shrinkage due to an unusually thin cytoplasm surrounding it. Thezona does not appear. X 625. Fig. 13 Two cell stage accompanied by a polar body. Note the presence of aconspicuous zona pellucida. X 750. 172 THE EARLY DEVELOPMENT OF SPELERPESBILINEATUS (GREEN) HUBERT DANA GOODALE ONE PLATE AND SEVENTY-SEVEN TEXT FIGURES^ CONTENTS Introduction 174 Part 1. Descriptive 174 The egg and its envelopes 174 The egg before cleavage with special reference to the yolk granules 176 Superficial aspect of cleavage 179 Regular 179 Irregular and abnormal 180 Rate and direction of progress of the third set of furrows 182 Internal aspect of cleavage 185 Connected blastomeres 188 Changes in the size of the egg 189 Changes in the shape of the blastopore and its fate 190 Formation and closure of the neural
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectanatomy, bookyear1901
