INDEX 



Abnormalities, starfish, 44. 

 Actinopoda, 129. 



Age of sexual maturity, starfish, 42. 

 Alimentary canal, holothurian, 116. 



key-hole urchin, 95. 



sand-dollar, 97. 



starfish, 25. 

 Amphioplus abditus, 14, 67, 75, 76, 

 79, 82. 



description, 83. 



geographical distribution, 82. 



habits, 82. 

 Amphioplus macilentus, 14, 79, 84. 



description, 84. • 



geographical distribution, 84. 

 Amphipholis squamata, 14, 69, 76, 

 77, 79, 81. 



description, 82. 



geographical distribution, 81. 

 Amphiura squamata, 81. 

 Amphiura elegans, 81. 

 Antedon dentatus, 13. 

 Arbacia punctulata, 14, 85, 88, 89, 

 102, 103, 104, 106, 107, 109. 



description, 107. 



geographical distribution, 107. 

 Arm plates, ophiuran, 70. 

 Artificial fertilization, 50. 

 Asterias, 33. 

 Asterias compta, 63, 64. 

 Asterias forbesi, 13, 19, 21, 22, 41, 



43. S9- 



description, 60. 



geographical distribution, 59. 

 Asterias rubens, 61. 

 Asterias tenera, 14, 59, 63. 



breeding habits, 52. 



description, 64. 



geographical distribution, 64. 

 Asterias vulgaris, 13, 25, 44, 48, 52, 

 59, 60, 61, 64. 



anatomy, 25. , 



breeding habits, 52. 



description, 62. 



geographical distribution, 61. 

 Asteroidea, 13, 19. 



alimentary canal, 25. 



behavior, 29. 



body walls, 21. 



branchiae, 21. 



circulatory system, 27. 



damage to oysters and other 

 mollusks, 33. 



development, 52. 



external structure, 20. 



food, 29. 



habits, 28. 



internal structure, 25. 



key to species, 58. 



locomotion, 19. 



method of feeding, 30. 



migration, 43. 



mouth, 22. 



movements, 24. 



natural enemies, 32. 



nervous system, 27. 



ossicles, 24. 



pedicellariae, 21. 



rate of growth, 40, 41. 



regeneration, 45. 



reproduction, 48. 



reproductive system, 28, 49. 



tube-feet, 22. 



variation in number and ar- 

 rangement of rays, 43. 



water-vascular system, 26. 

 Auricularia, 129. 

 Autotomy, holothurian, 125. 



ophiuran, 75. 



starfish, 45. 



Behavior, starfish, 29. 



Bibliography, 144. 



Bipinnaria, 53. 



Blastula, sea-urchin, 100. 



Blood starfish, 58, 65. 



Body walls, holothurian, 121. 



starfish, 21. 

 Branchiae, starfish, 21. 

 Brachiolaria, 53. 

 Breeding habits, Asterias forbesi, 49. 



Asterias tenera, %2. 



Asterias vulgaris, 52. 



Henricia, 52. 

 Breeding season, starfish, 49. 



Calcareous ring, holothurian, 118. 

 Circulatory system, starfish, 27. 



