XXVIl] ARCHAEOPTEEIS 563 



A. Jacksoni originally described by Dawson* and more recently 

 by Smith and White" from Devonian rocks of Maine, the 

 Canadian type A. gaspiensis Daws., and some species figured 

 by Lesquereux* from Pennsylvania, are examples of forms 

 which present a striking similarity in habit to the Irish species. 

 The Belgian Devonian fossils named by Crdpin^ Palaeopteris 

 hibernica var. minor are regarded by him as probably identical 

 with Goeppert's species Cyclopteris Roemeriana from the neigh- 

 bourhood of Aachen. Heer recorded Archaeopteris Roemeriana 

 from Upper Devonian beds in Bear Island, and Nathorst", who 

 has published a more complete account of the Arctic forms, 

 draws attention to the resemblance of some of them to 

 A. hibernica. A species described by Schmalhausen* from 

 the Upper Devonian of Southern Russia as A. archetypus 

 (fig. 369, D) appears to differ from A. hibernica in the slightly 

 less reduced lamina of the fertile segments. This species has 

 been more adequately illustrated by Nathorst' from material 

 collected in Ellesmere Land : he is unable to confirm Schmal- 

 hausen's statement that the pinnae are spirally disposed. 



The species A. fimbriata (fig. 369, G) described by Nathorst 

 from Bear Island is characterised by the more deeply dissected 

 lamina of the sterile pinnules. In A. fissilis Schmal. from 

 Russia and Ellesmere Land the lamina (fig. 369, E, F) is cut 

 up into filiform segments: a fertile pinnule of this species 

 is represented in fig. 369, E. 



Some sterile impressions figured by Krasser^ from Palaeozoic 

 strata (Lower Carboniferous or Upper Devonian ?) in the 

 province of Nanshan in China as Noeggerathia acuminifissa 

 are considered by Zeiller' to be portions of an Archaeopteris 

 or Rhacopteris, frond. The resemblance to the former genus 

 is however by no means close enough to warrant a reference 

 to Archaeopteris. The sterile specimens described by Stur*" 

 from the Culm of Altendorf as species of Archaeopteris are 



1 Dawson (71) A. ^ Smith and White (05) p. 39. 



' Lesquereux (80) A. * Cr^pin (74). 



« Nathorst (02). « Schmalhausen (94). ' Nathorst (04). 



8 Krasser (00) PI. i. figs. 3—7. » Zeiller (03^) p. 27. 



1" Star (75) A. Pis. viii. xn. xvi. 



