25° 



C. L. HERRICK 



Le pidodendron thwaitesi, sp. n. (Figs. 3 and 4.) 

 (C/. Bulletin oj the University of New AIexico,Yo\. II, Plate VII, Figs. 2 and ( ?) 4.) 

 Trunks of large size. Bolster somewhat oval, kite-shaped to rhomboidal, 

 about two and one-half times as long as wide, rather thickly set, but separated by 

 high striated ridges; length of bolster, 0.9 in.; width, 0.4 in.; 1.2 in., and 0.45 in., 

 1.3 in. and 0.5 in., in three cases; seven bolsters in the space of 4.5 in., measured 

 obliquely along the rows in branch over 6 in. in diameter, seven in 5 in. in a 

 larger specimen. Leaf scars (cicatrix) small, transversely oval, about one-fourth 

 as long as entire bolster. Middle of bolster below the cicatrix marked with a 

 ridge or depressed cauda, crossed by three very distinct frets. Transpiring vents 

 well marked on either side below the cicatrix, with which they are connected; 

 vascular trace punctiform, often absent. Ligular scar near apex of cicatrix, 

 triangular, often apparently notching apex of cicatrix. An escutcheon-like 

 impression between transpiratory vents. Leaves sharply acuminate with slen- 

 der tips, midrib strong, 3 in. wide and perhaps 8 in. long. 



Lepidodendron thwaitesi, var. striolatum, var. n. (Fig. 5.) 

 Greatly resembling L. thwaitesi, and perhaps a variety of that 

 species, but represented by smaller specimens in which the preserva- 

 tion is not very perfect. 



Bolsters uniformly rhomboidal oval, surface flat, about five in the space of 2.4 

 in. measured diagonally in the rows- Length, 0.72 in., width, 0.35 in. Space 

 below the cicatrix marked with numerous (5-7) irregular frets. Cicatrix appar- 

 ently as in L. thwaitesi. 



Lepidodendron socorroense, sp. n. (Figs. 6 and 7.) 

 {Bulletin of the University 0} New Mexico, Vol. II, Plate VII, Fig. i ?) 

 Trunks of moderate size, leaves slender. Bolsters rhomboidal to rhombic oval, 

 acuminate at the ends, nearly symmetrical; lower portion, from the leaf scar 

 downward, kite-shaped to rhomboidal, upper margin curved, the long axis marked 

 by a well-defined keel, very prominent near the lower angle, where is an elevation; 

 folar cicatrix about one-fourth the entire length of bolster; transpiratory append- 

 ages obscure; vascular pore on the most prominent part of cicatrix; a deep pit 

 below the cicatrix on median line; ligule large, well marked. Bolsters closely 

 approximate, in well-defined oblique series; 0.7 in. long, 0.3 in. wide. In a 

 trunk 3.2 in. in diameter 9 bolsters in space of 3.5 in., measured diagonally in 

 the rows; in larger trunks 9 bolsters in 4.3 in. 



This species is well represented, and is variable in size, but the 

 specimens leave much to be desired in detailed structure of the leaf 

 scars. 



Lepidodendron keyesi, sp. n. (Fig. 8.) 



Trunk of large size. Bolsters large, obovate, flat, closely approximate, in 

 well-defined diagonal rows. Eight bolsters in space of 4 in., measured obliquely 



