BULLETIN OF THE UNITED STATES FISH COMMISSION. 



Chapter X. Structure and Development of the He- 

 productive Organs — Continued. 

 The Female Reproductive Organs — Continued. 

 The Structure of the Ovary at the Time of 



Hatching of External Eggs 152-153 



Origin of the Ova 153 



The Metamorphosis of the Germinal Vesicle. . J . 153-154 

 Movements of the Nucleolus through the Action 



of Gravity 154-155 



The Ripe Ovum 155 



Development of the Reproductive Organs 156 



General Development 156 



Ovary 156 



Oviduct 157 



Seminal Receptacle 157 



Development of the Seminal Receptacle 158 



The Male Reproductive Organs 158 



Testis 158 



Vas deferens 158-159 



Spermatophores 159-160 



Sperm Cells 160 



Chapter XI. Habits of the Lobster from time of 



Matching until the period of Maturity . . . 161-166 

 Chapter XTL History of the Larval and early Ado- 

 lescent Periods 167-201 



Historical Notes 167-168 



Methods of Studying the Young 168-169 



The Embryo in Late Stages of Development 169-170 



The Hatching of the Larva 170 



The First Stage 171-172 



The Second Stage 172-173 



The Third Stage 173-174 



The Fourth Stage 174-176 



The Fifth Stage 176-177 



The Sixth Stage 177-178 



The Seventh Stage 178 



Description of Small Lobsters (Nos. 1-6, table 



35; No.l,table33) 179-182 



Molting of the Embryo and Larva 182-184 



Color Variations in the Young Lobster 184 



Page. 

 Chapter XII. History of the Larval and early Ado- 

 lescen t Periods — Continued. 



The Death-feigning Habit , 184-186 



The Food of the Larva 186-187 



Heliotropism of Larval Lobsters 187-189 



Mortality of Larvae 190 



Effect of increased Temperature upon the Rate 



of Development of Larva? 190-19] 



Development and Morphology of the Body and 



Appendages 191 



The Body 191-193 



The Visual Organs and Appendages 193-197 



Development of the First Pair of Pleopods . . 197-200 

 The Metamorphosis of the European lobster, 



LTomarus ga.mmarus 200 



The Shortening of the Metamorphosis of the 



Lobster 200-201 



Chapter XIII. Embryology of the Lobster 202-217 



Normal Development 202 



The Maturation and Segmentation of the 



Egg 202-203 



External Phenomena of Segmentation 203-205 



Internal Changes in Segmentation 205-206 



The Invagination Stage 206-209 



Later Stages in Embryonic Development . . - 209-210 



History of Yolk-Cells 210-211 



Degeneration of Cells 211-213 



Abnormal Development 213 



Segmentation of the Egg 213-214 



Invagination and Egg-Xauplius Stages 214-216 



Double Monsters in Ovum and Larva 216-217 



Note on the Development of Cambarns 217-218 



Chapter XIV. Summary of Observations 219-225 



Appendix I. Preparation of the Eggs 226-227 



Appendix H. Composition of the Shell and Gastro- 

 liths of the Lobster. By Professor Al- 

 bert W. Smith 227-228 



Appendix III. Bibliography 229-237 



Appendix IV. Description of Plates 238-252 



