Journal of morphology . THE HABITS AND DEVELOPMENT OF THENEWT {Diemyctylns viridescens). EDWIN O. JORDAN. TABLE OF CONTENTS. Page Introduction 7° I. Natural History -7° 1. Habitat -70 2. Food 7 ^ 3. Spermatophores -73 4. Receptaculum seminis 274 5. Egg-laying ? ^75 6. Transformations ^79 II. Maturation of the Ovum 280 1. Technique 2^° 2. Origin and developme7it of the ovum as a whole 282 3. Yolk-nucleus -^4 4. Yolk formation -9^ 5. Germinal vesicle as a whole 294 6. Nucleoli 296 7. Chromosojnes -99 8. General considerations 3°° 9. Atrophy of the germinal vesicle and formation of the polar bodi
Journal of morphology . THE HABITS AND DEVELOPMENT OF THENEWT {Diemyctylns viridescens). EDWIN O. JORDAN. TABLE OF CONTENTS. Page Introduction 7° I. Natural History -7° 1. Habitat -70 2. Food 7 ^ 3. Spermatophores -73 4. Receptaculum seminis 274 5. Egg-laying ? ^75 6. Transformations ^79 II. Maturation of the Ovum 280 1. Technique 2^° 2. Origin and developme7it of the ovum as a whole 282 3. Yolk-nucleus -^4 4. Yolk formation -9^ 5. Germinal vesicle as a whole 294 6. Nucleoli 296 7. Chromosojnes -99 8. General considerations 3°° 9. Atrophy of the germinal vesicle and formation of the polar 301 III. Fertilization 309 1. General phenomena 3°9 2. Polyspermy 3^5 IV. Cleavage 3^9 V. Formation of the Blastopore 3^5 1. Technique 3^5 2. Segmentatiott cavity Z^7 3. External appearances 3^8 4. Invagination 3-^^ VI. Fate of the Blastopore 334 1. Method of closure of the blastopore 33^ 2. Neuropore and anus 34° 3. Primitive streak 34 VII. Germ-layers and Notochord 347 1. Germ-layers 347 2. Notochord 3
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