IX] 



EQUISETITES LATERALIS. 



275 



It is impossible to give a satisfactory diagnosis of this 

 species without better material. The plant is characterised 

 chiefly by the great breadth of the stem, and by the possession 

 of leaf-sheaths consisting of numerous long and narrow seg- 

 ments. Equisetites Beani must have almost equalled in size 

 the Triassic species, E. arenaceus, described above. 



7. Equisetites lateralis Phill. Figs. 58, F, 63, and 64. 



This species is described at some length as affording a useful 

 illustration of the mi-^leading character of certain features which 



^ 





/^ 



Fig. 63. Equisetites lateralis Phill. From a specimen in the British Museum. 

 Slightly reduced. 



are entirely due to methods of preservation. The specific name 

 was proposed by Phillips in his first edition of the Geology of 



18—2 



