1160 



ON TRIBRACHYOCRINUS CORRUGATUS, 



- 



Dissymmetrical 

 Octagonal 



/- 



Large irregular Dissymmetrical 



Pentagonal 



Heptagonal 



B\^ 



L 



- 



Symmetrical 

 Quadrilateral 



Irregular 



Regular 



O 



Pentagonal Pentagonal 



Axis of the 



Dissymmetrical 

 Interradial 



<h Symmetrical ==»-)>- 



.2 5^.2 



Symmetrical 

 Region 







Dissymmetrical 

 Radial 



Sub-symmetrical 



Interradial 



Symmetrical 

 Radial 



Sub-symmetrical 

 Interradial 



Dissymmetrical. 

 Radial 



->P 



~ 7, 



S o 



Q 



ego 



.9 >> 2 

 3 o 9 

 5 O "§ — 



3bd o 



O 



OS fe 





The region 3, D.E. (D E) radiating from 3 can be called the 

 Symmetrical region, its plane axis cutting in halves 3 and (D E), 

 whilst the region nearly opposite including the first and second 



