DESCRIPTION OF SPECIES— CONIFERS— ABIBTINB^. 81 



of branches ; either long, two centimeters, very narrow, linear, less than one 

 millimeter broad, or shorter, broader, generally more crowded, lanceolate, 

 taper-pointed, somewhat enlarged in the middle, and gradually slightly nar- 

 rowed to the decurrent base, more than one millimeter broad and only eight 

 to ten millimeters long; the middle nerve is clearly and deeply marked upon 

 both kinds of leaves. In fig. 15, the leaves are short, much crowded, imbri- 

 cate and falcate; fig 17 has very narrow leaves of various lengths, straight, 

 or flexuous, or slightly falcate; figs. 17 and 18 have both kinds of leaves; 

 some very short and narrow, some broader and longer. Besides the specimens 

 with leaves variable in size, as pointed out in the figures, there is a large 

 number of others where variations of form may be clearly seen, and, there- 

 fore, all evidently represent the same species. By the falcate form of the 

 shorter leaves, it has some likeness to Sequoia Reichenhaclii, Heer, of the 

 Cretaceous. 



Habitat. — Point of Rocks {Dr F. V. Hayden); found in numerous speci- 

 mens. It appears, however, locally distributed, as the collection of Mr. Cle- 

 burn made at the same locality has not any specimens representing it. 



ABIETITES, Goepp. 

 Abietites dubius, Lesqz. 



Plate VII, Figs. 19-24. 



Abietites dubius, Lesqx., Annnal Report, 1869, p. 196 ; 1872, p. 374. 



Branches thick ; leaves open (those of the branchlets erect), loosely imbricated around the branches, 

 lanceolate, gradually narrowing to a sharp point ; broadest at the base, ■where they are abruptly rounded 

 to tlie point of attachment. 



This species, found first at the Raton Mountains by Dr. J. LeConte and 

 later by myself at the same locality in numerous specimens, has been also 

 sent from different places, all the specimens presenting the same charac- 

 ters. The branch leaves, loosely imbricated, as seen in fig. 19, are generally 

 more open, slightly narrower; those of the branchlets more erect and close ; 

 all exactly lanceolate, gradually narrowed to an acute point, abruptly rounded 

 to the point of attachment, flat, concave inside, and marked by a thin, 

 somewhat indistinct middle nerve ; the stems bear distinct leaf-scars, pre- 

 senting, as seen in figs. 19, 22, 23, 24, various forms, according to their age, 

 their size, and the different stages of maceration and compression. The 

 length of the leaves varies from seven to thirteen millimeters, the width from 

 a little less to a little more than one millimeter; the substance is not coria- 

 ceous, and they appear easily destroyed by maceration, the branches and 



6 T ¥ 



