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. 
Tas. 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. 
