FLORA OF THE KOOTANIE FORMATION. 301 



node belonging to one of the largest sized stems. The stem has been 

 compressed axially in such a manner as to carry away the diaphragm 

 and split down the sheath, so as. to separate the lower portions of the 

 teeth that had been united to form the sheath. The teeth thus appear 

 abnormally long. Their lancet shape is well shown in the upper portion 

 of some which are preserved entire. Fig. 8 shows a node bearing several 

 more or less perfect teeth. One of them is perfectly preserved, showing 

 the full size and shape. Fig. 9 shows two of these teeth enlarged two 

 diameters. This shows well also the depressions between the teeth in 

 the sheath. Fig. 10 gives a restoration of several of the teeth and a 

 portion of the sheath, much enlarged, to show details visible distinctly 

 only with the help of a lens. 



In my preUminary report on Mr. Weed's collection, mentioned 

 above, an Equisetum is noticed, and as it was thought to be probably 

 new, the provisional name E. montanense was suggested for it. The 

 numerous well-preserved impressions of this plant in the collection made 

 bv Professor Ward show that this is E. Phillipsii. This specimen is 

 represented in PL LXXII, Fig. 11. 



Equisetum Lyellii Mantell. 

 PI. LXXII, Figs. 12-14. 



1833. Equisetum Lyellii Mant.: Geology of the Southeast of England, pp. 217, 227, 



245, fig. 52 (1, 2, 3) on p. 245 (numbered on p. 399). 

 1843. Equisetites Lyellii (Mant.) Morr.: Catalogue of British Fossils, p. 8. 

 1898. Equisetum Lyellii Mant. Font, in Weed & Pirsson: Eighteenth Ann. Rep. 



U. S. Geol. Surv., 1896-97, Pt. Ill, p. 481. 



Along with the numerous imprints of Equisetum Phillipsii there 

 occur, much more rarely, imprints and fragments of the stems of a 

 smaller Equisetum. Its character is so constantly different from that 

 of E. Phillipsii that it can be distinguished at a glance. It agrees so 

 well with E. Lyellii, as described by Schenk," that it must be considered 

 as identical with that Wealden species. The larger stems are about 8 

 mm. in width. They are not well enough preserved to show with cer- 

 tainty all the character of the plant. The nodes seen are 2 cm. long. 

 The sheaths are apparently about 1 cm. in length, closely appressed to 



« Die Foss. Flor. der Nordwestdeutsch. Wealdenformation, p. 5, pi. i, figs. 10-13 (Palaeontographica, Vol. 

 XES, p. 207, pi. xxii, figs. 10-13). 



