IX] 



EQUISETITES PLATYODON. 



267 



described and figured by Lindley and Hutton^ as Hippurites 

 gigantea, and now usually spoken of as Galamitma, should be 

 named Equisetites. It would probably be better to adopt the 

 name Galamitina for the French species. The type-specimen 

 of this species is in the Natural History Museum, Paris. 



Fig. 59. Equisetites platyodon Bmngn. (After Schoenlein, slightly reduced.) 



When we pass from the Peimian to the Triassic period, we 

 find large easts of very modern-looking Equisetaceous stems 

 which must clearly be referred to the genus Equisetites. The 

 portion of a stem represented in fig. 59 known as Equisetites 

 platyodon Brongn.^ affords an example of a Triassic Equi- 

 setaceous stem with a clearly preserved leaf-sheath. The 

 stem measures about 6 cm. in diameter. One of the oldest 

 known Triassic species is Equisetites Mougeoti^ (Brongn.) from 

 the Bunter series of the Vosges. 



1 Lindley and Hutton (31) PI. oxiv. 



2 Schoenlein and Schenk (65) PI. v. fig. 1. 



3 Sohimper and Mougeot (44) p. 58, PI. xxix. 



