Annual report of the United States Geological Survey to the Secretary of the Interior . ens illustrating the aspect of fragments of this species, inwhich the apices of the slender, rather lax, leaflets are usuallyburied in the matrix or broken away. The specimens are fromthe New Lincoln colliery, where they probably occur in the roofof Lykens coal No. 2. Fijr. 8a. Enlarged detail, showingthe division and nervation of a young leaflet of thisspecies. Twice tha natural size. Upper l/ykent cornutum Dn. (Page 908. i Fig. 10. Ordinary example; from bed H, 550 feet below the Twi
Annual report of the United States Geological Survey to the Secretary of the Interior . ens illustrating the aspect of fragments of this species, inwhich the apices of the slender, rather lax, leaflets are usuallyburied in the matrix or broken away. The specimens are fromthe New Lincoln colliery, where they probably occur in the roofof Lykens coal No. 2. Fijr. 8a. Enlarged detail, showingthe division and nervation of a young leaflet of thisspecies. Twice tha natural size. Upper l/ykent cornutum Dn. (Page 908. i Fig. 10. Ordinary example; from bed H, 550 feet below the Twin coal, in the gap atPottsville. Upper Lykens Girtyi D. W. (Page 907.) Fig. 11. This specimen shows the very broad, thin wing, dilated in the lower por-tion, which is traversed by an obscure cuneate chalaza. The latteris delineated more distinctly than it appears in the original. Thespecimen is from the roof of Lykens coal No. 2 (or 1?) at the New Lincolncolliery. Upper Li/kens division. <«0 U. S. GEOLOGICAL SURVEY TWENTIETH ANNUAL REPORT PART II PL. CXCIII. ALETHOPTERIS NEUROPTERlS, SPHENOPHYLLUM, AND Lykens division. L1BKARY UNIVERSITY of ILLINOIS. I N D E X Numbers in italic are those of pages on which illustrations (plates or figures) appear; numbers inblack-laced type are those of pages on which detailed descriptions of species are given. Page. Abies Link 219,421 Abietites Hisinger 219, 309,1510 Abietites carolinensis Font 309,810,422,454 Abiquiu. New Mexico, Triassic plants from. 273, 317,319,335 rhombifolius Font 204, 287,288 Acrostichites Goppert. 240,,285, (Sagenopteris) acuminata (Presl) Ung 352 Acrostichites hrcvipennis Ward n. sp .. 334,422Acrostichites ? coniopteroides Ward n. sp 333, 122 Acrostichites densifolius Font 122 Acrostichites ? (Sagenopteris) diphylla (Presl) Ung 352 Acrostichites egyptiacus (Emm.) Font 280 Acrostichites ? fructifer Ward n. sp 3 3 3,422 Acrostichites i
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