CONTENTS, 
Page. 
Introduction 5-13 
Chapter I. Habits and Environment 14-32 
Distribution of the Lobster 14-10 
Character of the Environment 17 
Intelligence of the Lobster 17-18 
The Lobster’s Powers of Movement 18-20 i 
Periodical Migrations and their Relation to 
Changes in the Environment 20-27 
Sensibility to Light 27 
Digging and Burrowing Habits - 27-29 
The Eood of the Lobster and how it is procured. 29-32 
Chapter II. Hep roduction 33-74 
The Reproductive Organs 33-34 
Pairing of the Lobster and of other Crustacea.. 35-39 
The Laying of Eggs 39-40 
Summer Eggs in Vineyard Sound 41-43 
Summer Eggs on the Coast of Maine 43-44 
Fall and Winter Eggs at W oods Hole 44- 15 
Fall and Winter Eggs in other places 46-47 
Laying of the Eggs and Absorption of Ovar- 
ian Ova 47-49 
Number of Eggs Laid and Law of Production. . 50-55 
Period of Incubation at Woods Hole and Rate of 
Development 55-57 
The Hatching of the Eggs 57 
Time of Hatching of Lobsters at Woods 
Hole 57-58 
Dispersal of the Young 58-60 
Variations in the Time of Hatching 60-61 
Destruction of the Egg-Lobster and its Spawn . . 62-64 
Period of Sexual Maturity 65-70 
Frequency of Spawning 70-73 i 
Relative Abundance of tli e Sexes 73-74 j 
Chapter III. Molting and Growth 75-99 | 
Earlier Observations 75-77 | 
Structure and Growth of the Shell 77-78 I 
The Shedding of the Shell in the Lobster 79 1 
Molting Period 79-81 i 
Molting Process 81-82 | 
Habits of Molting Lobsters 82-83 
Casting of the Shell - 83-86 | 
Withdrawal of the Large Claws 86-87 
Cast-off Shell 87-88 
The Gastroliths 88 
Gastroliths in the Lobster; Their Structure 
and Development 88-91 
History of the Gastroliths ; Their Probable 
Function 91-93 
Chemical Analysis of the Shell and Gastro- 
liths 94 
Hardening of the New Shell 94-95 
Rate of Growth 96-99 
Page 
Chapter IV. Defensive Mutilation and Regenera- 
tion of Lost Parts 100-108 
Autotomy in the Young and Adult 100-103 
Regeneration of Appendages 103-104 
Regeneration of the Large Chelipeds 104-105 
Regeneration of the Antennas and Other Ap- 
pendages 105-107 
Internal Changes in Regeneration 107-108 
Chapter V. Large Lobsters 109-120 
The Greatest Size Attained by the Lobster ... . 109-117 
The Relation of Weight to Length of Body 118-120 
Chapter VI. Enemies of the Lobster 120-124 
Animals which prey upon the Lobster 120-122 
Parasites, Messmates, and Diseases 122-124 
Chapter VII. The Tegumental Glands , and their 
Relation to Sense Organs 125-133 
General Structure of the Tegumental Gland 125-126 
The Cement Glands 126 
Immediately before Ovulation 126 
Immediately alter Ovulation 126-127 
Historical Sketch of the Cement Gland 127-128 
Tegumental Glands in other Parts of the 
Body 128-129 
Experiments upon the Sensory Areas of the 
Body and A ppendages 1 29-133 
Chapter VIII. Variations in Color 134-1442 
Normal Coloration 134-135 
Variations in Color 135-137 
Color of the Eggs 137 
Blue Lobsters 137-138 
Red Lobsters 138-139 
Cream-colored Lobsters. 139-140 
, Variations in Color Patterns 140 
Spotted Lobsters 140 
Parti-colored Lobsters 141-142 
Chapter IX. Variations in Structure 143-149 
Normal Variations in the Large Claws 143 
Abnormal Variations in the Claws 143 
Similar Claws developed on Both Sides of the 
Body 143-144 
Division and Repetition of Appendages 144-148 
Variations in Other Organs 149 
Rostrum 149 
Ovary 149 
Hermaphroditism 149 
Chapter X. Structure and Development of the R/ 
productive Organs 150-160 
The Female Reproductive Organs 150 
The Ovary 150 
The Ripe Ovary 150-151 
The Ovary after Ovulation 151-152 
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