CORRELATION OF EARLY CRETACEOUS FLORAS. 



83 



II. — Descriptive List of Species. 



Equisetum Lyelli (Mantell.) (Fig. 1.) 



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Fig. 1. — Equiselum Lyelli. 



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This is a widely distributed species, common iu the English Wealden, found in the 

 Potomac formation of Virginia, and one of the forms recognized at G-rand Falls by New- 

 berry. It is not uncommon in the shales from Anthracite, though the specimens are 

 much flattened and crushed, and seem to represent branches rather than main stems. It 

 is distinguished by the long linear spine-like teeth of the sheaths. The sheaths are 1 cm. 

 long, and their teeth very long, narrow and pointed. The figure does not show the 

 sheaths which are very indistinct. 



Angiopteridium Canmorense (s. n.) (Fig. 2.) 



Fig. 2. — Angiopteridium Canmorense. 



Frond pinnate, leaves 5 cm. or more long, 6 mm. broad. Points not seen. One 

 specimen has four leaves somewhat widely separated. Another appears to be the apex of 

 a frond with parts of six leaves somewhat close together. The texture seems to have been 

 coriaceous and the A^einlets are very fine and close, and at right angles to the midrib. It 

 resembles A. strictinerve of Fontaine, but the materials are not sufficiently perfect for 

 satisfactory comparison. 



The genus was established by Schimper for a group of ferns resembling Tseniopteris 

 in venation, but differing in form and arrangement. They are widely distributed in 

 the Jurassic and Lower Cretaceous. The specimens are in Dr. Hayden's collections from 

 Canmore, where no doubt more perfect fronds may be found. In the meantime it may 

 provisionally named A. Canmorense. 



