PLATE CXC. 



AXEIMITES POrrSVILLENSIS D. W. 



(Page 868.) 



Figs. 1 atid 2. The frasiiieiit? show the small cuneate ujiper pinnules and the larger 

 Adiantitoid form. From the roof of Lykens coal Xo. 4, at the Lincoln 

 colliery. 



Lower Lykens division — Mariopteris pottsvillea zone. 



Mariopteris pottsvillea D. W. 



(Page 874.) 



Figs. 3, 4, 5, and 6. Figs. 3 and 4 represent the typical developments of the pinnpe 

 and pinnules of this well-marked species; fig. 5 shows the apex of a 

 compound pinna, while fig. 6 represents a fragment in which the pinnules 

 are much more than usually close. Specimens from the roof of Lykens 

 coal No. 4, at the Lincoln colliery. 



Fig. ?ta. Enlarged detail of one of the pinn?e shown in fig. 3, illustrating the lobes 

 and nervation. Twice the natural size. 



Fig. 4(/. Similar detail fiom the original of fig. 4. The fossil is somewhat distorted 

 by pressure in the shales. Twi(;e the natural size. 



Lower Lykens division — Mariopteris pottsvillea zone. 



Neitrofferis Pocahoxtas var. ix.equalis D. W. 

 (Page 890.) 



Figs. 7 and 8. These specimens show the elongated pinnules with Callipteridioid 

 bases, such as occur in the middle and upper portions of the pinnje. ■ 

 The specimen shown in fig. 7 is from bed D, 710 feet below the Twin coal 

 in the gap at Pottsville; the original of fig. 8 is from the Kalmia colliery. 



Lower Lykens division. 



WniTTLESEVA Camprelli D. W. 

 (Page 905.) 



Figs. 9, 10, and 11. These specimens show the characteristic aspect of the fasicular rilis 

 terminating in blunt, often obscure teeth, and the very slender jjctioles 

 of the leaves of this species. The originals of figs. 9 and 11 are from 

 beds H and D, respectively, in the section of the gap at Pottsville; 

 the specimen shown in fig. 10 comes from the roof of Lykens coal 

 No. 5 or No. (5 at the Lincoln colliery. 



Lower and Upper Lykens divisions. 

 924 



