phosseh.] ULSTER AND DELAWARE R. R. SECTION. 57 
In addition to the above species, Sir William identified one specimen 
as Lepidodendron primcevum Kogers, "the Knorria form." 
Lepidodendron primcevum was figured and named by Prof. H. D. 
Rogers in the Geology of Pennsylvania, ] from the Cadent series [Hamil- 
ton] at the mouth of Standing [Stone] Creek, east of Huntingdon, Pa. 
Lesquereux 2 reported the age of the specimen as Marcellus, while 
Prof. T. C. White gave the horizon of the rocks at the mouth of this 
creek as Genesee ; 3 finally Rogers' figure is reproduced by Prof. Lesley 
in his final report under the head of " Hamilton sandstone fossils." 4 
There are, however, paleontological reasons for considering the age of 
these rocks as of the Upper Hamilton stage rather than the Marcellus 
or Genesee. 
Dawson 5 reported " a Lepidodendron, obscurely preserved, but appar- 
ently of the type of L. YeWteimianum, and possibly the same with L. 
primcevum of Rogers," from the Upper Devonian (supposed Genesee 
shale) of Kettle Point, on Lake Huron, Ontario, Canada. 
Dawson states that there are fragments of a Lepidodendron, which 
seem to belong to this species, in the Portage of Milo, Yates County, N. Y. 
Dr. J. M. Clarke 7 reports this species from the Styliola layer of Ontario 
County, N. Y., and at Black Point, CauandaiguaLake, Ontario County, 
N. Y., both in the Genesee shale. Also from the Naples (Portage) at 
Naples, Ontario County, (the remarkable specimen now in the New 
York State Museum at Albany having been obtained from Grime's 
Gully near Naples); and from the township of Sparta, Livingston 
County. 8 The occurrence of this species in the Genesee and Portage 
of Ontario County, is again mentioned by Dr. Clarke, 9 who states that 
Dr. Dawson identified the specimens from the Styliola layer. 10 
Dr. Clarke 11 published a letter giving a general description of the 
Naples specimen, in which he said "if it had been found in fragments, 
taken from different spots, it would furnish all the necessary material 
for a half dozen distinct species of lepidodendron, according to preva- 
lent methods of determining these values. Moreover, toward ihe 
base, the leaves are uniformly arranged on elevated longitudinal 
ridges, as in JSigillaria, showing nothing of the quincunx arrangement, 
apparent higher up, and regarded as a diagnostic character of lepido- 
dendron. In this region, also, the longitudinal ridges are interrupted 
by a series of varices, suggestive of an equisetaceous mode of growth." 
This specimen was found by Mr. D. D. Luther and sold to the New 
i Vol. II, Pt. II, 1858, pp. 828, 820, fig. 075 on p. 828. 
2 2d Geol. Surv. Penn., I'. 1880, p. 377. 
3 Ibid., T* 1885, p. 261; and see the map of the vicinity of Huntingdon on p. 25G. 
* Ibid., Sum. Desc. Geol. Penn., Vol. II, 1802, p. 1284. 
6 Am. Jour. Science, 3d Scr., Vol. I, 1871, p. 258. 
"Quart. Jour. Geol. Soc, Vol. XXXVII. 1881, p. 302. 
' Bull. U. S. Geol. Surv., No. 1G, 1885, pp. 25, 20, 33. 
8 Op. cit, pp. 63,64. 
9 Kept. State Geol. [New York] tor 18S4, 18S5, pp. 18, 19, 21. 
>°Op. cit., p. 18, f. n. 
» Science, Vol. IX, May 27, 18*7, p. 516. 
