EXPLANATION OF THE FIGURES. 13 



Fio 

 $7. Muscular ribbons of the willow-moth> ( Cossw ligniperda. ) 



28. Vertebra of a cod-fish. 



29. Disposition of the muscles of the trout, (Salmo trutta.) 



30. Disposition of the muscles of an owl, (Strix brachyotis.) 



31. Jelly-fishes, (Stomobrachium cruciatum, Hippocrene Bougaimrittv*} 



32. Leech, showing the terminal cups. 



33. Portion of a Nereis, showing the gills as organs of motion. 

 34-43. Modifications of the fore-arm. 



34. Monkey. 35. Deer. 36. Tiger. 37. Whale. 38. Bat. 

 39. Pigeon. 40. Turtle. 41. Sloth. 42. Mole. 43. Whale. 



44, Leg of a beetle. 



45. Leg of a lizard. 



46 Skeleton of a tiger. 



47 Cuttle-fish, (Loliyo illecebrosa.) 



48 Sea-anemone, (Actinia marginata-) a, mouth ; 6, stomach ; c, general 



cavity of the body. 



49. Planaria, showing the mouth, stomach, and its branches. 



50. Jaws, stomach, and intestine of a sea-urchin, (Echinus lividus.) 



61. Plan of the digestive organs of an insect. 



62. Plan of the digestive organs of a land-slug, ( Tebennophorus Carolina 



ensis.) 



53. Globules of chyle. 



54. Portion of intestine, showing the lacteals of man, and their entrance 



into a vein. 



55. Jaws of an Echinoderm, (Echinarachnius parma 



56. Jaws of a sea-urchin, (Echinus granulatus.) 



57. Beak of a cuttle-fish. 



58. Portion of the tongue of a mollusk, (Natica heros,) magnified. 



59. Jaws of an Annelide, (Nereis.) 



60. Trophi (organs for taking food) of a beetle. 



61. " of a bee. 



62. 63. " of a squash-bug. 



64. " of a butterfly. 



65. " of a Rotifer, (Brachionus.) 



66. Jaws of ditto, magnified. 



67. Skull of a tiger, showing the muscles for mastication. 



68. Head of a snapping-turtle, (Emysaurus serpentina.) 



69. Head of a Whale, showing the whalebone. 



70. Head of an ant-eater. 



71. Head of an alligator. 



72. Head of a skate-fish, (Mijliobatis,') showing the palate bcne. 



73. Head of a monkey, showing the three different kinds of teeth. 



74. Teeth of an insectivorous animal, the mole. 



75. Teeth of a carnivorous animal, the tiger. 



76. Teeth cf a rodent 



