60 



reproduced, which too manifests this particular symmetry very 

 beautifully. Another instance is the' diagram of Daphne Mezereum. 



Of group C v & innumerable repre- 

 sentatives are found in living nature, 

 as well among plants as animals. 

 It even seems that a certain prefe- 

 rence for this special symmetry may 

 be supposed to exist, which is the 

 more remarkable, because exactly 

 this symmetry is quite mpossible 

 for crystalline matter. In fig. 64. 

 the fruits of Swietenia mahagoni, 

 in fig. 65 that of Ceiba pentandra, 

 and in fig. 66 that of Adansonia 

 Baobab, all after Gaertner, are 

 reproduced here as good examples 

 Fi S- 6 4- of this class. Of blossom-diagrams 



Fruit of Swietenia mahagoni. we draw attention to the COrolla 



of Campanula medium, and of Platycodon grandiflorus, both in fig. 67 . 

 Other instances are the diagrams of Carduus crispus, of Cucurbita 

 pepo, of He- 

 dera helix, 

 etc. 



Among 

 the lower 

 animals the 

 most beau- 

 tiful instan- 

 ces of this 

 symmetry- 

 class are 

 found in 



the Blastoidea, some of which are reprodu- 

 ced in fig. 6 p on Table / (p. 64). The lime- 

 armour of Orophocrinus stelliformis (fig. p), of 

 Pentremites orbignyanus, (fig. 8) of Phaeno- 

 schisma acutum (fig. 7), and that of Aster o- 

 blastus stellatus (fig. 6) are, according to 



Fig. 66. 

 Fruit of Adansonia Baobab. 



Fig. 65. 

 Fruit of 



Ceiba pentandra. 



Haeckel's drawings, splendid illustrations of this kind. Finally 

 we must not forget the well-known forms of the star-fishes, e.g., 



