308 



ANALYTICAL INDEX. 



CHAPTER VI.— continued. 



Hydra with 100 tentacula, 



Nature of the hydra, 



Sustenance, 



Errors in treating zoophytes, 



Motion of the Cristatella, 



Volition resides in the common mass, 



Peculiarities of motion, 



Cristatella, a nocturnal animal, 



Its duration, 



Perpetuation, 



Atoms are incomprehensible, 



No ovarium in the Cristatella, . 



Ova dispersed in its substance, 



Liberated on its decay, 



Specimen exhibited to the British Association, 



Its history, .... 



Ova, ..... 



Contents matured in 202 days, 



Provisions of Nature, 



Nascent hydra floats head downwards, 



Hydras developed successively, 



Breeding season, 



Does not divide spontaneously, 



Where found in Scotland, 



An affectionate relative, 



Cristatella, a wonderful production, 



Deductions and conclusions, 



Plates XXVII., XXVIII. explained, 



PAGE 80 



90 

 91 

 92 

 ib. 

 ib. 

 93 

 ib. 

 94 

 ib. 

 ib. 

 ib. 

 95 

 ib. 

 ib. 

 ib. 

 96 

 ib. 

 97 

 ib. 

 ib. 

 98 

 99 

 ib. 

 ib. 

 ib. 

 100 

 ib. 



§ 2. Alcyonella, 



Diversity of circumstances affects objects, 



(1.) Alcyonella stagnorum, 



Analogies with the Flustra hispida, 



Hydra with 42-44 tentacula, 



Its nature, 



Of no kindred to the Cristatella, 



Perpetuation, 



Ova, chiefly from decay of hydra, . 



Cause of ova moving in the hydra, 



Ovum described, 



Contents matured in 167 days, 



Clusters of hydra? floating reversed, 



101 

 102 

 ib. 

 ib. 

 103 

 ib. 

 104 

 ib. 

 105 

 ib. 

 106 

 ib. 

 107 



