CONTENTS. IX 



The two great groups of sea-worms, Tubicola and Errantia. 

 Serpula, their abundance and general structure. Geo- 

 logical antiquity of the group. Spirorbis. The Crystal 

 Palace aquarium. Sdbella, Terebella, &c. The Errantia. 

 The "Lob-worms." Antiquity of the family. Physio- 

 logical structure. The " Sea-centipede." Alternation of 

 generations. Eunice, Polynoe, Phyllodoce, Nemertes, &c. 

 The Sipuneulus. Harmony of creation . . . Pages 69 to 83 



VI. 



HALF AN HOUR WITH CORALLINES. 



General notions respecting these objects. Their structure. 

 Relations to the Hydras. Tubularians, or " Pipe-coral- 

 lines." The various species described. The Sertularians, 

 or " sea-firs." Their general structure. The five genera. 

 The "Bottle-brush" coralline, "Sickle'* coralline, "Sea- 

 hair" coralline, "Sea-oak" coralline, "Fern" coralline, 

 "SquirrePs-tail" coralline, "Sea-cypress" coralline, &c. 

 The Campanularidse. Their reproduction in medusoids, 

 or jelly-fish. The " Bird's-head " coralline, " Lobster's- 

 horn" coralline, &c. Alternation of generation in the 

 group. Relation of the jelly-fish to them, &c. Pages 84 to 104 



VII. 



HALF AN HOUR WITH JELLY-FISH. 



The appearance of jelly-fish when stranded, and when in the 

 sea. Natural history of the group. Zoological division of 

 ditto. The " Crimson-ringed " jelly-fish. Its general struc- 

 ture. Stages through which the young pass before reach- 

 ing adult. Hydra tuba, &c. Cyanea, Thaumantia, Turris, 

 Sarsia, JEquora. The " Portuguese Man-of-war." Velella. 

 The Beroe. Its beauty. Lucernaria. Small quantity of 

 solid matter in jelly-fish. Production of marine phos- 

 phorescence, c Pages 105 to 117 



