^^^j!"*] proceedings op the NATIONAr. MUSEUM. 271 



Pagiophyllum dubium sp. iiov. 



I'l. XXXIX, Fi;^s. 2-11. 



Troo or slinih, witli tlic. ixiiiillinial*- and iiltiniHte twifjK, wlii<;h 

 alone \v<'i<i sern, iJMid, (^ylindriral, and (|iiit<5 lliick. Tin; leaves are 

 slijLtlitly imbricatJMl, or overlap by their tips, wliieli are lliin'ftnd pareli- 

 nieut-lik<', while their bases aie eonsideiably thickened. 'I'liey are 

 closely approssed to the- smiaee. of the twin's, and show no keel or 

 proininonce of any kind. Tlu-y vary nine li in shape, beinj; broadly tri- 

 an.^nlaioi- broadly elli|>lieal, sonielinies roinnb'd snlxpiadrilateral. All 

 are very obtuse an«l rounded a) llieir lips, and lia\«' lln-ir j;i-eatest di- 

 mensions transverse to the axis of the twi^. 'llw. epidermis is thin, 

 l»ut apjiaicnlly (piite durable, and the outer surface «»f the, leaves is 

 marked by lines of pits which aic distinctly visible to the unassisted 

 eye, tlu" lines coii\erj;in^ l<»ward the tips of the leaves, and being ap- 

 proximatel>' jKirallel to their margins. ^J'hese inij)riids aie exactly like 

 those seen on the epidermis of l''reneIo]»sis, which is strikingly like 

 that of the plant n<»w in (pieslion. The eories, sinj;le or in j>airs, at 

 th<' (Mid of slioit, very stout idtimale. blanches, are small and jilol)ular in 

 form, the Iar;;('st se(Mi l)ein^ about lo""" in diametei', and the smallest 

 K""". '^J'he cone-bearing l)ranches have, next under the (-ones, leaves 

 of different cliaracter from tlie noiinal ones. They resemble much ab 

 breviated ]»oints of FrenelojtKiH raridiis. TImy vary in shajte from the 

 normal kiiuls to those in whi(di the edg«;s of the leav<'s ai»p«'ar as trans- 

 verse liues more or less convex ujtwaids, and concave «lownwaid, only 

 one lank of b'aves apjK'aring on the anterior surfac(}of the stem. 



'I'he scales of the cones are closely appressed, small, numerous, 

 si)iially arrange<l, thickened at the fre(! ends, inolonged into an in<urv 

 ing spiny beak like that of Aiaucaria. The Ijeak l)eing removed 

 leaves a scar not unlike that of Aiaucaria, ]>eing a rhombic-shaped 

 depression, nnudi elongat<Ml transveisely. 



The S4'ales of the cones, when wholly removed, as tiiey g(Mierally are, 

 leave im]»iints tliat ar(; in shape subrhombic to ))ioadly ellijiti<-al, and 

 prolong(*d at the tijis to a more or less acute jtoint. 



This remarkable conifer is the most common fossil at the Glen Rose 

 locality. The twigs are not specially al)undant, but the cones are very 

 numerous, being much ihe most abundant fossil. Tlu-y were; borne on 

 the summit of stout ultimate twigs, that generally broke off a little be- 

 low the bas(i of the cone, so that usually a short ]»iece of the twig is 

 found with each cone. Owing to the fa(;t that the exterior of the fossils 

 3t Glen Rose is geru'rally removed in breaking the stone, th(;sei)ortions 

 pf the twigs attaeluMl to the cones do not often show tin; chaiacter of 

 the loaves, Htill a (;onHidera])le nuniber of specimens are found 

 with a few of the leavey pretty well preserved. Unfortunately none of 

 the twigs attached to cones are long enough to show more than three or 

 foip- jeftvps, Hence the (character of the Je^^vcs on more remote portions 



