CONTENTS. 



CHAPTER III. 



Page 

 The brachiopodous MoUusks — Why so called — Lingula — Terebratula 



— The mantle adapted to respiration — Action of this part — Orbicula 

 ^The most minute animals demand attention — Tunicata — Singular 

 shapeless being — Admirable structure of this creature — Curious marine 

 animals — Numbers of distinct individuals united by suckers into one 

 mass— Their strange production of animals, dissimilar in form and habits 



— Star-like bunches, or tufts, attached to sea- weed — The Pyrosoma— A 

 lesson of humility 33 



CHAPTER IV. 



Phosphorescence of the ocean — Various appearances — How are these 

 eflects accounted for ? — The question answered — Phosphorescent plants 

 and animals — Decomposition of animal substances in the sea — Statement 

 from Mr. G. Bennett's " Wanderings" — Abundance of the Pyrosoma— 

 Light needed in the waters — Phosphorescence of the sea a solace and 

 warning to the mariner 49 



CHAPTER V. 



Headless Mollusks — Their structure — Cable, or byssus of the Mus- 

 sel—Manufacture of the threads which form it— A little cup, or sucker, 

 at the end of each thread — The Pinna and its friend — Admirable struc- 

 ture of valves and tendons— The Great Clam— Extraordinary shells— The 

 Oyster — Its structure- Gradual formation of its shell— Its great fruitful- 

 ness— The " spats," or eggs— Growth of the Oyster — Reason of their being 

 laid with the flat sides uppermost — Native Oysters — Oyster beds — Dredg- 

 ing for Oysters GO 



