540 PKOCEEDIXGS OF THE AVASHINGTON MEETING 



F. and I. C. W. sp., P. angustipinna, PAanceolata, Equisetites eloiigatus F. and I. C. W. , 

 and Cordaites crassinervis F. and I. C. W. 



Several of the species in the preceding list might be placed in the latter cate- 

 gory. However, it must not be forgotten that these are perhaps purely American 

 species, some of which may be found common to the as yet but partially known 

 floras of the Monongahela and Conemaugh. 



An argument for Permian age that is at once important and interesting is offered 

 in the presence in the Dunkard of a number of types or forms whose seemingly 

 nearest relatives are Mesozoic or Avhose facies or details strongly suggest types 

 characteristic of the Mesozoic. The most striking of these plants are Equisetites 

 striatus F. and I. C. W., resembling the Mesozoic Equisetum ; Nematophyllum an- 

 gustum F. and I. C. W., compared by the authors with Schizoneura; a variety of 

 Fecopteris dentata Brongn., forcibly suggestive of Thy rsopteris ; P. {CaUipteridiiim?) 

 odontopteroides F. and I. C. W. sp., which has a Cladophlebis habit and aspect ; Sphe- 

 nopteris pachypteroides F. and I. C. W. ; S. pachynervis F. and I. C. W. ; Saportsea, 

 especially S. grandifolia F. and I. C. W.,* which seems to lean as much toward 

 the Mesozoic Ginkgo group as toward Rhipidopsis ; Jeanpaidia (Boicra) virginiana 

 (F. and I. C W.), a generic type generally characteristic of the Trias, though pres- 

 ent also in the Rothliegende, and Tseniopteris neuberryana F. and I. C. W., a sin- 

 gular form comparable to T. coriacea Goepp., but which might well stand as type 

 of a new genus, probably belonging to the Mesozoic group of large- pinnuled Mar- 

 rattiaceous forms. 



Invincibly against the reference of the beds to a level above the basal Permian 

 stands the reported presence of a considerable element of Coal Measures species in 

 the Dunkard. Many of these species are of common occurrence in the Allegheny 

 formation, though others belong more propeily to the higher Coal Measures. The 

 number of such species, given by the authors as 22, is now known to be much 

 greater, since the study of the Monongahela flora, though but partially accom- 

 plished, shows a large number of plants described from the Dunkard to be also 

 present in the older formation. Among the species more common in the Coal 

 Measures are— 



Fecopteris dentala Brongn., P. emarginata (Goepp.) Presl.,* P. elegnns (Goepp.) 

 Germ., P. arguta^iQvnh., F. pennseforinis Brongn., P. arhorescens (Schloth.)Brongn.,* 

 P. oreopteridia (Schloth.) Sternb.,* P. Miltoni (Artis) Brongn., P. candolleana 

 Brongn. ,* P. pteroides Brongn.,* P. Fluckenet'd Bongn.,* P. ICallipteridinmf] grandi- 

 foliumY. and W. sp., Neuropteris fimbriata Lx., iV. Flezuosa Sternb., t Neuropteris 

 hirsiUa'Lx. (form), N. auriculataGerm. ,'^ Aphlebia filiciformis {Guth.) Sterz. , Calamiles 

 Siickowii Brongn., Asterophyllites equisetiformis (Schloth.) Brongn.,* Annidaria stellata 

 (Schloth,) Wood,* Ann. radiata Brongn., Ann. sphenophylloides (Zenk.)Gutb.,*ASp/i^»o- 

 phyllum filiculme Lx.,* S. longifolium Germ.,* S. oblovgifolium Germ.,* and Sigillaria 

 brardii Brongn. 



*The two species of Saportcea are probablj' still more closely related to Noeggerathia dispar 

 Dawson, from the Coal Measures of Nova Scotia. 



*The species marked by the asterisk (*) are reported in the lower Rothliegende, though they 

 are more common in the older formations. 



f The species described under this name by Fontaine and While does not represent the plant 

 described by Sternberg. It is related to A', ovata Hoffm. The Neuropteris flexnosa var. longifolia 

 F. and W. of the Pennsylvania report appears to be but a variety of N. plnnchardi Zeill., from tlie 

 topmost Coal Measures and Lower Rothliegende of Europe and may be designated as the variety 

 longifolia of the latter species. 



