1160 



ON TRIBRACHYOCRINUS CORRUGATUS, 



Dissymmetrical 

 Octagonal 



W Dissymmetrical 

 ^ Interradial 



!5 Symmetrical ^^^ 



[^ 



Large irregular Dissymmetrical 



<1 



Pentagonal 



Heptagonal 



Dissymmetrical 

 Radial 



Sub-symmetrical 

 Interradial 



^P 



Symmetrical 

 Quadrilateral 



11)=^ 



PiM 



Irregular Regular 



Pentagonal Pentagonal 



Axis of the 



Symmetrical 

 Region 





Symmetrical 

 Radial 



Sub-symmetrical 

 Interradial 



Dissymmetrical. 

 Radial 



O rt O 





"^ jC :e 3 



llll 



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 



