DESCRIPTION OF SrEClES. 33 



inflated at the point of attachment, taper-pointed or hmg-acuniinate ; nerves 

 parallel, thin, numerous, coming close together and dichotomous near the 

 base. 



Nothing similar to these leaves has been published in fossil plants, and 

 indeed no li\'ing plants are comparable to them, except the large leaves of 

 some species of Dammara; those, for example, of Z>. rohnsta Moore, from Aus- 

 tralia, which are 14'"" long, -4-5°" broad in the middle, and resend)le in their 

 form Fig. 10 of oiu' plate. This leaf does not appear narrowed above into 

 a long acumen like that of Fig. 9, which may represent a different species, 

 as its base is not quite as narrow or visibly inflated. 



The nervation of these fossil leaves is the same as that of D. rohitsfa, 

 and in Fig. 10 the leaves are narrowed in the same manner as in the living 

 plant to a short petiole, which is a little enlarged at the inflated point of 

 attachment. The ner\'es of D. rohusta number 7-8 in 5™"" of diametral 

 space, or a little more than 0.5°"" distant. In the fossil leaf they are 1-2"°' 

 apart, rarely less. 



In both fossil and living leaves the nervation is more or less effaced 

 by compression of the thick coriaceous sxibstance. The relation of these 

 leaves to the genus Daminara is confirmed by the discovery of tAvo species 

 of fruits of this kind described by Heer from the Cretaceous of Greenland, 

 D. borealis and D. microlepis} 



Habitat : Ellsworth County, Kansas. No. 1 1 78 of the National Museum. 

 Fig. 10 is No. '200 of the collection of the Museum of Comparative Zoology 

 of Cambridge, Massachusetts. 



Dammarites emakginatus Lesq. 

 PI. I, Fig. 11. 



Podozamites emarginatiis Lesq., Oret. and Tert. PL, p. 29. 



Leaves very thick, half tubulose or very concave on the lower side, 

 entire on the border, linear-oblong, rounded and emarginate at the apex, 

 narrowed from the middle downward to a flat, short, broad pedicel. Nerves 

 parallel, close but distinct, 1""" distant, converging near the upper border 

 toward the apex of the leaf and at the base to the petiole, and there dichot- 

 omous. 



No form has been found to which it is possible to refer this leaf, which 

 is beautifully preserved and seems by its nervation and its short flat petiole 

 to be referable to Dammara. 



I Fl. Fobs. Arct., vol. 6, 2 Abth., p. 54, PL xxxvn, Fig. 5 ; p. 55, PL XL, Fig. 5, 

 MON XVII 3 



