ILLUSTRATIONS 



Arterial 



side 



FIG. 



41. The Common Marine Mussel (Mytilus edulis) .... 



42. Inner side of the Shell (right valve) of the Fresh-water Mussel (Anodonta) 



43. Inner side of the Shell (right valve) of the Marine Mussel (Mytilus) 



44. Transverse Section of Gill of Fresh-water Mussel (Anodonta) 



45. The Fresh-water Mussel. Shell removed .... 



46. The Fresh-water Mussel dissected from the left side to show the general structure 



47. The Marine Mussel dissected from the left side to show the general structure 



48. The Lanoelet (Amphioxus lanceolatus) viewed from the left side 



49. Amphioxus dissected from the right side 



50. Transverse Sections of Amphioxus 



51. The Spiny Dogfish (Acanthias, syn. Squalus) 



52. The Dogfish (Acanthias, syn. Squalus). Dissection 



53. The Skate (Baia). Dissection 



54. Urino -genital System of the Dogfish 



55. Dorsal View of the Pectoral Girdle and Fin Skeleton of the Skate 



56. Afferent Branchial or Ventral Arterial System of the Dogfish 



57. The Afferent Branchial or Ventral Arterial System of the Skate . 



58. The Dogfish (Acanthias, syn. SqiiMus). Efferent Branchial or Dorsal 



System ........ 



59. The Efferent Branchial or Dorsal Arterial System of the Skate and of the Dogfish 



(Soyllium) ..... 



60. Skull and Visceral Arches of the Dogfish (Soyllium) as seen from the left 



61. The Brain, Cranial Nerves and Eye Muscles of the Dogfish 



62. Ventral View of the Brain of the Dogfish 



63. The Braiqi, Cranial Nerves, and Eye Muscles of the Skate 



64. The Frog (Rana). The Platana or Clawed Toad (Xenopus) 



65. Buccal or Mouth Cavity of Rana and of Xenopus 



66. Muscular System and Vascular System (part) of Rana and of Xenopus 



67. Dissection of Rana and of Xenopus, showing the Alimentary System 



68. Muscles of the Left Hind-limb of Rana and of Xenopus, from the Ventral Surface 



69. Muscles of the Left Hind-limb of Rana and of Xenopus, from the Dorsal Surface 



70. Venous System (part) of Rana and of Xenopus, from the Ventral Aspect 



71. Dissection of the Leg of Rana and of Xenopus, from the Dorsal Surface 



72. Arterial System of Rana and of Xenopus . 



73. The Alimentary Canal of Rana and of Xenopus . 



74. The Urino-genital System (male) of Rana and of Xenopus 



75. The Urino-genital System (female) of Rana and of Xenopus 



76. Pectoral Girdle of Rana and of Xenopus . 

 11. Pelvic Girdle of Rana and of Xenopus, side view . 



78. The Hind-limb and the Fore-limb of Xenopus 



79. The Vertebral Column and Pelvic Girdle of Rana and of Xenopus 



80. Dorsal View of the Skull of Rana and of Xenopus 



81. Ventral View of the Skull of Rana and of Xenopus 



82. Side View of the Skull of Rana and of Xenopus . 



83. Spinal Nerves and Sympathetic Nervous System (left side only) 



Xenopus 



84. The Brain and the principal Cranial Nerves of the Frog (RaTia) 



85. The. Pigeon (Columha). Dissection showing the principal Viscera 



of Rana and of 



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