INTEODTJCTION, 



37 



number of new specific names tends to confusion and misleading 

 conclusions. 



Cladophkbis virginiensis, Font. \ ^^^ *'"' 'P^"^^' OladophUlu denticulata 



C. denticulata, Font. I (^rongn.) and Todites WiUiamsoni 



0. fakata, Font, (and other species) ( {^^"^S^-l are, I believe, represented 



J among the Potomac lems. 



(cf. Coniopteris kymenophylloides (Brongn.) 

 (fertile pinnae). This species is probably 

 represented by some of the fronds referred 

 by Fontaine, on insufficient eTidence, to 

 Thyrsopta-is. 

 ScUropteris elliptica. Font. ; cf. Paekypteris lanceolata. 

 JPlatypteriffium densinene, Font. ; cf. Nilssonia compta (Phill.). 

 Ctenopteris insignis, Font. ; cf. Ftilozamites. 

 Nageiopsis mierophylla ; cf . N. anglica. 



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

 Williamsonia virginiensis, Font. ; cf. Williamsonia gigas (L. & H.). 



In 1896 Fontaine' published a list of foBsU plants from Cali- 

 fornia whicli he identified as probably Lower Oolite species ; these 

 include species of the genera CladopMelis and Thyrsopteris, also 

 ? Sagenopteris rhoifolia, Pachyphyllum WilUamsonis, Podozamites 

 laneeolatus, species of Ctenophyllum and Ctenis. 



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

 also been described by Newberry* 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 vdth European Jurassic forms ; 

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

 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.' 



Cladophlehis faleata. Font. ; cf. C. denticulata (Brongn.). 



Leptostrohus longifolms. Font. | ^ f Czehanowskia Murrayana (L. & H.). 

 Finns susKwaensis, Daws. ; 



' Fontaine (96). 

 ' Newberry (88). 

 3 Dawson (85) (92). 



