38 UNITED STATES GEOLOGICAL SUEVEY— TERTIARY FLORA. 



of divergence come out from a tumescence of the jirincipal axis, as repre- 

 sented partly in fig. 6 ; sometimes they are comparatively small and in 

 right angle, penetrating the sandstone in every direction and in such a way 

 that, as the remains are extremely abundant, it is very difficult to separate 

 them even in small fragments. The surface is more or less evidently striate; 

 the young branches are nearly smooth, the larger stems deeply, somewhat 

 irregularly wrinkled or rather veined, as the striae appear here and there 

 parallel and distinct to the eye, but not permanent upon wide surfaces. 



Habitat. — Sandstone underlying the coal beds at the base of the Raton 

 Mountains, New Mexico. 



Halymenitcs major, Lesqz. 



Plate I, Figs. 7, 8. 



Halymenites major, Lesqx., Annual Report, 1872, pp. 373, 390. 



Frond of the same size and modo of division as in tlie former species ; surface marked by round 

 contiguous or separate tubercles. 



The frond of this species appears to have been still larger than that 

 of the former, cylindrical, rarely and slightly flattened ; pinnately, or dichoto- 

 mously, or abnormally divided in shorter, smaller branches, very variable in 

 length; surface covered with round, elevated, or half-globular tubercles, two 

 to five millimeters broad, and as thick as broad. As in the former species, 

 the divisions from the main axis often proceed from an intumescence, or knot, 

 where from two to three, or even four branches come out diverging all around. 

 In other cases, the branches are merely alternately forking or dichotomous, 

 and regular in their divisions. The tubercles of the surface are either distant 

 or separate, as in fig. 8, or crowded and connected on the borders, as in fig. 7 ; 

 more or less irregular and variable in size, even upon the same fragment, but 

 always present. Even the specimens which appear to have been exposed for 

 a long time to atmospheric influence, or to abrasions by water, show distinctly 

 the scars of the impression of the tubercles by deep circular lines upon the 

 stony compound. 



Habitat. — This species, extremely common in the sandstone of the 

 Lignitic measures, is found at various stages ; at Black Butte, Golden, Carbon, 

 and especially at the Raton Mountains, with the former. Prof Meek fi)und 

 it in the sandstone of Coalville, which he considers as of Cretaceous age. 

 It has been sent nearly with every lot of specimens collected by Prof Hayden 

 and his assistants. Its highest station is at Carbon. 



