CONTENTS. XI 



Structure and mode of growth. Comatula ; its organization 

 and habits. Pentacrinus the young of Comatula a brittle 

 subject for the aquarium p. 170-186 



CHAPTER XIX. 



ASTEROPHYTQN " THE SHETLAND ABGU8.". ... p. 187-191 



CHAPTER XX. 



OPHIURUS " THE PLATE-MAIL STAR-FISH." 



Alarm amongst the Cockatoos.- Illustrations of instinct j true 

 and false. Structure of Ophiurus. History of Pluteus para- 

 doxus. Transformation of Pluteus. Ophiocoma. p. 192-200 



CHAPTER XXI. 



ASTERIAS " THE CROSS-FISH." 



Habits of the Northern Sea-star. How Star-fishes eat oysters. 

 Habit of casting off their rays. Renovation of mutilated 

 Star-fishes. Fisherman's blunder. A seaside breakfast. 

 Disappointment. Importance of Star-fishes in creation; 

 their treatment in the aquarium ; suicidal propensities. 

 "Eyes" and "eyelids" of the Star-fishes. Eggs of the 

 Star-fish. Development of young Asterias p. 201-213 



CHAPTER XXH. 



ECHINUS " SEA-URCHIN." 



Origin of name. Shell of Echinus esculentus. Wonderful com- 

 plexity of structure. Necessity for such contrivance. How 

 the shell grows. Ambulacral plates. Suckers and loco- 

 motive spines. Food of the Sea-urchins. Teeth of the 

 Echinus. "Lantern of Aristotle." Roe of the Sea-egg. 

 Le stufe di Nerone. A delightful bathe. Eggs, Pluteus, and 

 metamorphosis of Echinus. Pedicellarise. Reparation of 

 injuries p. 214-233 



