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CANADIAN FOSSILS. 



I have described these three species in a paper contributed to the 

 Geological Society of London, March 22, 1871. They have not been 

 found in Canada ; but are of interest as shewing the existence of tree ferns 

 in strata even older than the fern beds of St. John. In Gasp<5 I have 

 found some fossil stems which are probably tree ferns, but too obscure for 

 description. Illustrations of two of these trunks of tree ferns are given 

 in the wood-cuts. 



(^Fruitfi, ^o). 



Genus — Cardiooarpum— Bronq. 



108. Cardiooarpum cornutum, Dn. — (PI. XIX., Figs 214 to 218.) 

 —J. G. S., XVIII 324; PI. XIII., Figs 23 and 24.— M.D., St- 

 John, New Brunswick. 



" Broadly ovate, emarginate at base, dividing into two inflexed processes 

 at top. A mesial line proceeds frMi the sinus between the cusps, 

 downward. Nucleus more obtuse than the envelope, and acuminate 

 at the top. Surface of the flattened envelope striate, that of the 



nucleus more or less rugose. 



Length about seven lines." 



109. Cardiooarpum Baxlbyi, Dn.— (PI. XIX., Fig. 219.)— Acad. 

 Geol., p. 554. — M. D., St. John, New Brunswick. 



Broadly cordate; emarginnte at apex, one inch and ahalfhroad, one inch long. 

 Nuclcitt large, broadly oval, acuminate, with a mesial line reaching to 

 the ends. 



110. Cardiooarpum Crampii, Hartt— (PI. XIX., Figs. 220 to 222.)— 

 , Acad. Geol., p. 554. — M.D., St. John, New Brunswick. 



Elongate, slightly expanding at the middle, obtuse at base. Obtuse or emar- 

 ginate at apex. Length about one inch, greatest breadth about two fifths of 

 an inch ; nucleus small, central, oval, connected by a mesial line with the 

 extremities. Surface of margin slightly rugose." 



111. Cardiooarpum ovale, S. N.— (PI. XX, Figs. 223, 224.)— M.D., 

 St. John, New Brunswick. . ., - 



Oval and destitute of a notch, the sides of the margin expanded laterally, the 

 nucleus ovate and acuminate. - •. 



This species, found with those above-named, but more rarely, seems to 

 have been of aimilar structure. 



