MR. HENFREY ON THE ELATERS OF TRICHIA. 223 



two edges. The appearance of the spiral fibres is very clear with low powers, yet I do not 

 consider that they are sufficient to prove the actual structure ; but a very high power in 

 my opinion renders it unmistakeable, while the fact of obtaining the free ends of the fibres 

 in an elater broken across, puts the question beyond doubt. 



EXPLANATION OF THE FIGURES. 



Tab. XXIV. 



Fig. 19. Spiral fibres in Elater of Trichia (serotina, Schrad.?), magnified 1000 diameters. 

 Fig. 20. Another view of the same. 

 Fig. 21. Ideal diagram of the same. 





