4 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Page. 
Chapter X. Structure and Development of the Re- 
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 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 
Hatching until the period of Maturity . . . 161-166 
Chapter XII. 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 Lato 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. 1, table 33) 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- 
lescent Periods — Continued. 
The Death-feigning Habit 184-186 
The Food of the Larva 186-187 
Heliotropism of Larval Lobsters 187-189 
Mortality of Larvte 190 
Effect of increased Temperature upon the Rate 
of Development of Larva: 190-191 
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, 
Ho marus gommarus 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-Nauplius Stages 214-216 
Double Monsters in Ovum and Larva 216-217 
N ote on the Development of Cambarus 217-218 
Chapter XIV. Summary of Observations 219-225 
Appendix I. Preparation of the Eggs 226-227 
Appendix II. 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 
