CONTENTS. 



Page. 



Introduction 5-13 



Chapter r. Habits and Environment 14-32 



Distribution of the Lobster 14-10 



Cbaracter of the Environment 17 



Intelligence of the Lobster 17-18 



The Lobster's Powers of Movement 18-20 



Periodical Migrations and their Relation to 



Changes in the Environment 20-27 



Sensibility to Light 27 



Digging and Burrowing Habits 27-29 



The Food of tho Lobster and how it is procured . 29-32 



Chapter II. Rep roductiou 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 Woods Hole 44-15 



Fall and Winter Eggs iu other places 46-47 



Laying of the Eggs and Absorption of Ovar- 

 ian Ova 47^9 



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 



Freq uency of Spawning 70-73 



Relative Abundance of the Sexes 73-74 



Chapter HI. Molting and Growth 75-99 



Earlier Observations 75-77 



Structure and Growth of the Shell 77-78 



The Shedding of the Shell in the Lobster 79 



Molting Period 79-81 



Molting Process 81-82 



Habita 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 Farts 100-108 



Autotomy iu the Young and Adult 100-103 



Regeneration of Appendages 103-104 



Regeneration of the Large Chelipeds 104-105 



Regeneration of the Antenna 1 , 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 theLobster - 120-122 



Parasites, Messmates, and Diseases 122-124 



Chapter VII. The Tegumental Glands, and their 



lielation In Sense Organs 125-133 



General Structure of the Tegumental Gland 125-126 



The. Cement Glands 126 



Immediately before Ovulation 126 



Immediately after 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 Appendages 129-133 



Chapter VIII. Variations in Color 134-14S 



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 139-1 40 



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 Devdoyntcnt of the Re- 

 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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