KEGENERATED AND ABNOEMAL APPENDAGES IN THE 

 LOBSTER. 



BY VICTOR E, EMMEL, 



SHOWN UNIVERSITY, PROVIDENCE, R. I. 



TABLE OF CONTENTS. 



I. Introduction 101 



II. Abnormal Appendages 102 



A. Explanation of Terms 102 



B. Abnormal Chelae found in the Lobster 103 



1. Extra Processes arising from the Normal Dactyl 103 



2. Abnormal Processes arising from the Normal Propodite. 105 



a. Two Extra Dactyls and Double Extra Index 105 



b. Two Extra Indices and Double Extra Dactyl. . . . 107 



3. Two Extra Chelae arising from the Meropodite 108 



4. Similar Claws on both Sides of the Body 112 



III. Regenerated Abnormal Chelipeds 113 



1. The Regeneration of a Triple Claw on a Walking Leg 113 



a. Development 1 14 



b. Morphological Characteristics 116 



2. Other Experiments and Observations on Abnormalities in Re- 



generating Limbs 118 



a. An Extra Bud on a Regenerating Leg 118 



b. A Double Regeneratmg Papilla 119 



c. Various Methods of Mutilation and Results 120 



3. The Regeneration of Two Crusher Claws 121 



a. Data 121 



b. Morphological Comparison of the Normal and Regener- 



ated Chelse 123 



c. Resume 128 



