1892.] NEW YORK ACADEMY OF SCIENCES. 141 



Psilophyfon Dechenianus with which I am acquainted," and he 

 makes the F. Dechenianus (Grbpp.) Carr. include as a synonym the 

 P. robustius Dn. 



Weiss, Zeit. Deutschen g:eol. Gesellschaft, vol. xli, 1889, p. 168, 

 stated that he considered the Drepanophycus spinaeformis Gopp. 

 (Nov. Act. Acad. Caes. Leop.-Car. Nat. Cur. vol. xxii, Supple- 

 ment, 1852, p. 92, pi. xli, fig. 1) as belonging to that part of the 

 genus Psilophyton which includes P. princeps. Weiss proposed, 

 since it is claimed by Soms-Laubach that P. princepfi and P. robus- 

 tius are genericall)^ distinct, to restrict the genus Psilophyton to P. 

 robustius and allied forms, and since Drepanophycus would be a 

 misnomer in reference to the systematic position of the fossil, to 

 substitute Drepanophytum for P. princeps. Dawson, op. cit., p. 

 553, answers the proposition of Weiss, and states that he does not 

 consider Drepanophycus as a Psilophyton, but thinks it is possible 

 that it may be identical with his Arthrostigma. It is quite safe 

 to say that Goppert's figure of D. spinaefoi'mis bears very little 

 resemblance to the Canadian specimens of Psilophyton, with which 

 American paleontologists are well acquainted, thanks to the descrip- 

 tions and generous distribution of specimens by Sir William Daw- 

 son. Finally, as to the question of priority, Dawson (op. cit., p. 

 554) shows concisely and correctly that Drepanophytum Weiss 

 would date from 1889, and not from 1852, when Drepanophycus was 

 described by Goppert. Weiss answers Dawson's letter (op. cit., 

 p. 554) and reaffirms his previous opinion as to the division of 

 Psilophyton into Drepanophytum spinaeforme and D. jyrinceps 

 and Psilophyton robustius, etc. (op. cit., p. 555). 



Dawson, Nature, vol. 41, April 10, 1890, p. 53T, identifies this 

 si^ecies from the Old Red Sandstone of Perthshire, Scotland. 



Prosser, Am. Geol., vol. vii, 1891, p 365, reported specimens 

 from Kaaterskill Clove, in the eastern Catskills of Greene County, 

 New" York, from a horizon several hundred feet above what has 

 been considered the base of the Catskill ; but the writer's studies in 

 eastern New York lead him to consider the lower portion of the 

 so-called Catskill in this region as of an age equivalent to the Che- 

 mung and Portage of southern and western New York.' 



From the above review it will be seen that Psilophyton princeps 

 Dn., when compared with other Devonian species of fossil plants, 

 has quite an extended distribution and is most abundant in the 

 Lower and Middle Devonian, but also ranges from the Upper 

 Silurian to the Upper Devonian of Gasp^, occurs in the Upper 

 Devonian of eastern New York (doubtful Catskill), and is reported 

 from the sub-Carboniferous (Waverly) of Ohio. 



Gelluloxylon primsevum genus and species described by Dawson 



» Oct. 1, '92. See account of Professor Hall's paper before the Rochester 

 meeting of the Geol. Soc. of America on the " Oneonta Sandstone," in which it 

 is stated that the " Oneonta sandstone passed eastwardly into the lower fats- 

 kill and westwardly into the Portage." Am. Geologist, vol. x (September, 

 1892), p. 194. 



