148 ANALYTICAL INDEX. 



Page. 



Experiments proving that it has specks or eyes, .... 27 



Their position and number, 28 



Propagation by an egg, 29 



It is imbued with a viscous matter, ib. 



Several young come from it, 30 



Period required for their exclusion, 31 



This animal enjoys high reproductive powers, 32 



Regeneration of parts depends on the prevailing tem- 

 perature, . . ib. 



New organs are colourless, 33 



A gluten or mucus exudes from the body, 34 



Monstrosities, . . 35 



Individuals of doubtful species, ib. 



Planaria Panniculata, \ 37 



It is not so common as the Nigra, 39 



Propagates by eggs, . . 40 



One young Planaria or more comes from each egg, . . ib. 



Planarise extirpated by diseases, 41 



Planaria Felina, 42 



It is provided with real tentacula, 43 



Number of marginal specks or eyes, 44 



It lives in society, 45 



Remains quiescent next the light, 46 



Planariae form a glutinous or silken thread, ib. 



Food of the Felina, 47 



Doubtful if it propagates by eggs or foetuses, 49 



Propagation by spontaneous division of the body, ... 50 



The fragment separating is of uncertain size, 51 



It is quiescent after separation, 53 



Progress and perfection of reproduction, 54 



Successive separations of the same body, ib. 



The organization of the sundered portion is obscure, . 58 



Regeneration is affected by temperature, 59 



No other mode of propagation has hitherto been ob- 

 served, 60 



Examples in other animals, 61 



Natural monstrosities, 62 



