15O ANALYTICAL INDEX. 



Page. 



Water contains a certain pabulum beneficial to its in- 

 habitants, 107 



Progress of reproductions, 108 



Spontaneous division occurs more rarely than in the 



Planaria Felina, 109 



Possibly it is promoted by the suffering of the animal, 110 

 This Planaria has not been observed in stagnant water, 113 



All animals are restricted to certain climates, ib. 



Trivial distinctions should be disregarded in the clas- 

 sification of animals, 115 



Planaria Graminea, 116 



Its motion is comparatively swift, 118 



Position of the mouth, 120 



This Planaria is a hermaphrodite, 121 



It propagates by eggs, 122 



Their position in the animal alters, 123 



The oviduct is perhaps near the mouth, 124 



Some animals die in giving birth to their young, ... 125 



Number of eggs in the Planaria Graminea, 126 



Myriads of animated beings inhabit marshes, 128 



Planaria Velox, 129 



It has red eyes, 130 



All planariae characterized by dropping through the 



water, 131 



Number of eggs in the Planaria Velox, 132 



Planaria Edinensis, 134 



Site of the mouth, 135 



The shape alters from feeding, 136 



Appearance and position of the egg, 137 



It is void of viscosity, 138 



One young Planaria comes from each egg, 139 



Nature of this animal, ib. 



Planariae are defenceless creatures, 140 



General conclusions, 141 



FINIS. 



