viii List of Illustrations. 



23. ' Pinna nobilis, and Pinna rugosa ... ... 307 



24. Varieties of Seaweed ... ... ... ... ... 316 



25. Ulva latissima (Green Sloke), and Chondrus crispus (Carrageen 



Moss)... ... ... ... ... ... ... 319 



26. Hawksbill Turtle 352 



27. Green or Edible Turtle ... ... ... ... 364 



28. Diving for Pearl Shells at Panama ... ... ... 384 



29. Mother-of- Pearl Shell, and Anodonta herculae ... ... 411 



30. Corallium nobilis, or red Coral, with a piece magnified, showing 



the Polypes ... ... ... ... ... 437 



31. Varieties of Coral ... 440 



