1892.] NEW YORK ACADEMY OF SCIENCES. 139 



regular bifurcating impressions, probably aerial roots of a ealamite 

 or feru. 



Fossil wood was also found near this ledge which was apparently 

 contained in a concretion and called the "fossil trees" by Mr. 

 Cooley. The specimen obtained from this locality has been studied 

 by Professor F. H. Knowlton, Assistant Paleontologist of the U. 

 S. Greological Survey, and he identifies it as Celluloxylon primae- 

 vum Dn. 



Since neither the geographic distribution nor the geologic range 

 of the two species identified from this locality is considerable, it 

 may be valuable for the purpose of correlation to cite all those 

 references which furnish data bearing upon these two points. 



Psilophi/ton princeps was described by Dawson in the Quart. 

 Jour. Geol. Soc, London, vol. xv, Pt. I, 1859. The genus was 

 described on p. 478; figs, la-li were given on p. 479, li lieing a 

 restoration, and sections of stems figs. Ik-ln, p. 480 ; while the 

 specific name was proposed on p. 481. The specimens were reported 

 from the lower or middle Devonian of Gaspe, Lower Canada. In 

 this paper, on p. 482, Dr. Dawson mentions fossil plants previously 

 described that may belong to this species. First is the plant figured 

 by Yanuxem in 1842 (Geol. New York, Pt. Ill, p. 161), from a 

 quarry west of Xorth New Berlin [now New Berlin], Chenango 

 County, New York, which is in the upper part of the Hamilton. 



Dichotomous roots from Orkney and Caithness," described by 

 Salter, and "bifurcating plants with curved tendrils like branehlets 

 figured by Hugh Miller" from the Old Red Sandstone of Scotland, 

 are considered as belonging to this genus. Also, Haliserites 

 Dechenianus Gopp., in the Lower Devonian of Rhenish Prussia, 

 is considered a plant of this genus (op. cit., p. 483). 



Dawson, Canadian Nat. and Geol., vol. vi, June, 1861, p. 175, 

 reported the species from Perry, Maine, and on p. 179 doubtfully 

 from St. John, N. B. 



Dawson, Quart. Jour. Geol. Soc, vol. xviii, 1862, pp. 298, 315, 

 326, gives a more complete account of the range and distribution of 

 the species. On p. 315 it is stated that the species is characteristic 

 of the whole Devonian system at Gaspe, and "fragments -which 

 ma}' have belonged to it occur in the Upper Silurian." It is also 

 mentioned from Perry, Maine, which, in the table on p. 326, is 

 called Upper Devonian ; from the Hamilton at Schoharie, N. Y., 

 and Akron, Ohio (Professor Hall, 16th An. Rept. Regents Univ. 

 State N. Y. on Cond. State Cab. Nat. Hist., Appendix D, 1863, p. 

 108, foot-note, states that "The beds at Akron are of the age of 

 the Chemung, of New York, or the Waverly sandstone of Ohio"), 

 and from what is called the Chemung at Cascade Falls. [It is not 

 stated whether Cascade Falls is in Ohio or New York, and the 

 locality seems to have been lost. Dr. J. M. Clarke writes me that 

 " The locality of ' Cascade Falls' is unknown to both Professor 

 Hall and myself." While Sir Wm. Dawson says, " I am afraid I 

 cannot be sure of the locality of the specimens from Cascade Falls, 



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