AVHiTE.] NOTES ON CHAKACTERISTIC SPECIES. V)03 



Lincoln colliery, though its frequent occurrence at other localities is 

 at or near the horizon of Lykens coal No. 4. 



BOTHRODENDKON ARBORESCENS (Lx). 



The examination of the stem fragments in the types described by 

 Lesquereux as LycopocUtes arlorescens' reveals leaf scars showing the 

 typical characters of the genus Bothrodendron. The collections in 

 hand from the lower portion of the Kanawha series in West Virginia 

 show that this genus is not rare at that stage in the Coal Measures 

 in the United States. Bothrodendron arhorescens, the originals of 

 which are from the Sewanee zone in Washington County, Arkansas, 

 while the Pennsylvania representatives occur in the plant beds 380 

 feet below the Twin coal in the Pottsville Gap, appears to constitute 

 the oldest representative of the genus yet discovered on this continent. 



CORDAITES ROBBII Dn. 



The identity of the leaves from the Pottsville formation with the 

 species described by Dawson' from the fern ledges at St. John, New 

 Brunswick, seems to be fully assured by a comparison of material from 

 the type localitv. The species appears to be especially common in the 

 Upper Lykens division of the formation, although it has a wider vertical 

 rano-e. It is quite possible that the form which will eventually be 

 described as Cordaites Phinipsl is not more than varietally distinct 

 from the St. John type. In the Southern Anthracite field the species 

 occurs, as at St. John, in association with Cardiocarpon cornutum. It 

 is found at the supposed horizon of Lykens coals 2 or 3, about 650 

 feet below the Twin coal, in the Pottsville Gap, in the shales accom- 

 panying the upper Lykens coals at the Lincoln mines, in the Lower 

 Lykens division at the Brookside mines, and in the Lincoln mine. It 

 is'also found accompanying the upper Lykens coal in Yellow Springs 



Gap. 



Cordaites akgustifolius Dn. 



The material which I refer to this species appears to be in agree- 

 ment with the species figured by Sir William Dawson from the tern 

 ledges at St. John,^ rather than with the material earlier described 

 from the Devonian at Gaspe. If the Gaspe fossils are specifically 

 different from those at St. John, as appears to be the case from an 

 inspection of the figures, the name should be retaine d for the Gaspe 



"coal Flora, Vol. III,^, pl. evi, fig. l! Lacoe collection, United States National Muse-nm, Xos. 



'TquS' Jouf Ll Soc. Lond., Vol. XVIII. p. .10, pL xiv, fi.. 31a-e; Acadian Geol 186S, pp. 534 

 and ,544, flg. 190; Fossil Plants of the Devonian and Upper Silurian Formations of Canada, 18,1, p. 43, 



'^Qi^r? Jout'Sr^oe. Lond., Vol. XVIII, p. 318; Fossil Plants of the Devonian an,l .pper 

 SilnrianFonnationsofCanada, lS71,p. 44, pl. xiv., fig. ]63a-e. ,h.- „ -..i li^ 428 



" H'anadian Naturalist. Vol. VI, pp. 170 and 17G, fig. He; Logan, Geol. < unada, Lso.., p. -U, l.g. 428. 



