LIST OF ILLUSTRATIONS xii 



FIG. . PAGE 



25. The Thick-lipped Grey Mullet ....... 57 



26. The Fifteen-spined or Sea Stickleback . . . . -57 



27. The Common or Ballan Wrasse ...... 57 



28. The Common Pipe-fish ........ 58 



29. Diagram of a dissection of a female of the smaller spotted Dog-fish to 



show the ovary and oviducts (after Milnes Marshall) . . .63 



30. Diagram of a Herring with its body cavity laid open at the lower edge, to 



show the roes and intestines, &c. ...... 65 



31.- Diagram of the interior structure of the soft roe or testis in the Herring. 66 



32. Similar diagram of the hard roe or ovary of the same fish . . .66 



33. Sperms of various fishes, highly magnified ..... 73 



34. The abdomen of the female Sole, laid open with the organs in their 



natural position ..... 75 



35. The same after removal of the liver and gut, the roe seen in its whole 



length .......... 75 



36. The abdomen of the male Sole laid open with the organs in their natural 



position . . . . . ... . . -77 



37. The same after removal of the liver and gut ... -77 



38. Egg of the larger Spotted Dog-fish, or Nurse-hound (after Day) . . 85 



39. Living Egg of the Herring, magnified 



40. Egg of the Sea-snail (Liparis] as seen when alive and magnified . . 89 



41. Egg of the Double-spotted Sucker (Lepadogaster) . . .9 

 42 Egg of a species of Goby, from lower side of stone on shore at Falmouth 91 

 43. Butter Fish with its mass of spawn (after Holt) . 9 2 

 44- Egg of the Smelt, with its suspending membrane . 93 

 45-48. Diagrams of the chief types of floating marine fish-eggs . 95 

 49. A single globule of Noctiluca ... -9 

 50-54. The development of a buoyant marine fish-egg . 



55. Newly-hatched young (larva) of the Common Black Goby . 102 



56-58. Three stages in the development of the Cod, showing the transforma- 

 tion of the larva into the perfect form 



59-62. Four stages in the transformation of the Flounder i5 



63. The Common Hermit Crab, lying beside the whelk-shell which it inhabits 120 



64. A Swimming Crab ... 



65. Ampelisca, a common marine Amphipod 



66-70. Molluscs which commonly serve as food for fishes 



