INTRODUCTION. 37 



number of new specific names tends to confusion and misleading 



conclusions. 



1 The two species Cladophkbis dentieulata 

 Cladophkbis virgimensis, ront. r , _ ... T^-,,. 



(Brongn.) and Todites 77 ilhamsoni 



C. dentieulata. Font. f T , ,. . i 



. .. . . j (Brongn.) are, I believe, represented 



C. fakata, Font, (and other species) , 



} among the Potomac ferns. 



s cf. Coniopteris hymenophylloides (Brongn.) 



,. .. fl . T-, , (fertile pinnae). This species is probably 



AnpleniontcrisadKintifolia.com,. , /T . , , j 



' . represented by some of the fronds referred 



Axpidwm macrocarpum. ront. . , . , . . ., 



by Fontaine, on insufficient evidence, to 



Thyrsopteris. 



Sckropteris elliptica, Font. ; cf. Pachypteris lanceolata. 

 Platypterigium deminerve, Font. ; cf. Nilssonia eompta (Phill.). 

 Ctenopteris insignis, Font. ; cf. Ptilozamites. 

 Nageiopsis microphylla ; cf. N. anglica. 



Cephalotaxopsis (several species) ; cf. Taxites zamioides (Leek., ex Bean MS.). 

 jniliamsonia virginiensis, Font. ; cf. Williamsoma gtgas (L. & H.). 



In 1896 Fontaine 1 published a list of fossil plants from Cali- 

 fornia which he identified as probably Lower Oolite species ; these 

 include species of the genera Cladophlebis and Thyrsopten's, also 

 ? Sagenopteris rhoifolia, Pachyphyllum Williamsonis, Podozamites 

 lanceolatus, species of Ctenophyllum and Ctenix. 



One or two species, comparable with Lower Oolite forms, have 

 also been described by Newberry 3 from Triassic rocks of New 

 Jersey and the Connecticut Valley. 



2. CANADA. 



The plant-bearing strata of Canada have afforded but few species 

 which may be considered identical with European Jurassic forms ; 

 but some of the plants obtained from the strata in the Rocky 

 Mountains, named by Dr. G. M. Dawson the Kootanie Series, 

 appear to be very closely allied to Lower Oolite species. Sir 

 William Dawson has drawn attention to the presence of certain 

 types in the Kootanie flora, which recall species described by Heer 

 from Jurassic rocks of Siberia. 3 

 Cladophlebis fakata, Font.; cf. C. dentieulata (Brongn.). 



Leptostrobut longifolius, Font, j = ? Czekanowskia Murrayana (L. & H.). 

 Pinus smkwaensis, Daws. ) 



1 Fontaine (96). 



2 Newberry (88). 



s Dawson (85) (92). 



