WHITE.] NOTES ON CHAEACTEKISTIC SPECIES. 897 



eatsily differentiated by their form and nervation from anj^ other 

 species with "which I am familiar. Occasionally a small narrow pin- 

 nule, such as that in Fig. 7, suggests, particularly in its nervation, pin- 

 nules of JT. rarinet'vis. Even these may be separated b}^ recalling the 

 dilated and distinctly cordate bases and the slightly concave lateral 

 margins of the latter. 



This species is abundant in the roof shales over L3'kens coal No. 1 

 at the Lincoln mines. 



ASTEROPHYLLITES PARVULUS Dn, 



The specimens from the Southern Anthracite field which I refer to 

 this species appear to be in complete agreement both with the plant 

 originally described under the above name from the supposed middle 

 Devonian beds at St. John,^ New Brunswick, and with the mate- 

 rial from Rushville, Ohio, described by Andrews^ as AsteroplnjUites? 

 m hi utus. 



Subsequent stratigraphic and paleontologic study of the deposit of 

 dark leather}' shales at Rushville shows them to be probably not far 

 from the horizon of the Sharon coal in Ohio. Many of the examples 

 of the AsterojyhyUltes from the Southern field are even smaller than 

 those figured by Sir William Dawson and Professor Andrews. This 

 species, perhaps the smallest of its genus, is closely related to Astero- 

 phyUites arhansamis and A. grandis. Although to a certain extent 

 characteristic of the Sewanee zone throughout the central Appalachain 

 region, the Aderojyliyllites ])armil%is is not only common in the same 

 zone of the anthracite region, but it is often abundant in the roof 

 shales of Lykens coal No. 4, in which horizon it is found at the 

 Brookside and Lincoln mines. 



ASTEROPHYLLITES ARKANSANUS nom. nOV. 



The species to which I give the name AsteropJiyllites arhansanus 

 is that known in the American literature as Asterophyllites gracilis^ 

 a name which, unfortunately, must be a1)andoned, the A. gracilis 

 (Sternb.) Brongn. having priority. As originally described^ by Les- 

 quereux, from the coal-bearing shales of Arkansas, the species is 

 especially characterized by the thick axes of the branchlets, the angu- 

 larity and dilation of the internodes, and the strongly reflexed, out- 

 ward-curved, slightly angular, and rapidh" tapering, small, acute 

 leaves. The plant is found associated with the Upper L^'kens coals 

 at the Lincoln mines and at the supposed approximate horizon of 

 Lykens coal No. 3 in the gap at Pottsville. 



1 Dawson, Acadian Geology, 1868, p. 540, fig. 188 A»-=; Fossil Plants of the Devonian and Upper Silur- 

 ian Formations of Canada, 1871, p. 27. 



2 Kept. Geol. Survey Ohio, 1875, Vol. II, Pt. II, p. 424, pi. li, figs. 4, 4-'. 

 3Rept. Geol. Surv. Arkansas, Vol. II, ISGO, p. 310, pi. ii, figs. 4 and 4«. 



20 GEOL, PT 2 57 



