206 FLORA OF LOWER COAL MEASURES OP MISSOURL 



surface, and tliei'efore directed downward; exposed surface of the bolsters 

 on the compressed specimens rather narrowly transversely rhomboidal, 

 very acute at the sides, the lateral ang-les very slender and often curving 

 slightl}' downward in ])assing around the median arch of the next bolster 

 below and to the left, the four sides being nearh' straight, though really 

 sinuate, and unsymmetrical on the upper border by reason of tlie phyllo- 

 taxy; lower borders of the exposed surfaces generally slightly concave, 

 though very neaidy straight except when passing around the median arch of 

 the preceding bolster in the next spu-al to the left ; leaf scar usually hi the 

 lower ang-le of the compressed bolster, transversely rhomboidal, the lateral 

 angles very slender and acute; lower borders of the scar slightly concave 

 near the lateral angles, nearly straight in the middle, at an angle of about 

 135°, and rounded at the base of the scar; upper borders of the scar some- 

 what concave and rounded near the median line to a flat or sometimes dis- 

 tinctly emarginate tipper angle; inside cicatricules below the middle of 

 the leaf scar; vascular trace always below the middle of the leaf scar, 

 round or slightly elongated horizontally, the lateral cicatricules being- very 

 small, punctiform, ratlier distant from the center and situated very close to 

 the lower margin of the scar; ventral trace very close to the leaf scar, 

 small, broadly triangular, and situated at the distal end of a low-rounded, 

 vanishing longitudinal ridge. 



On entering upon the study of the specimens of Lepidopliloios from 

 Missouri described above, it seemed probable that ainong the material, 

 which fortunately had been collected in good quantity, would be found 

 some representatives of Lepidopliloios dilatatus Lx., a number of the origi- 

 nals of which are said to have come from the same beds in the same region. 

 But although the discovery in the Lacoe collection of several frag-ments 

 from the -sdeinity of Clinton labeled with the latter name b}' Lesquereux 

 made it seem certain, especially since they are specificall}^ identical with 

 those before me, that this anticipation would be realized, very careful 

 examination and comparison of all the Missouri specimens to which 1 have 

 had access with the description and figures given by Professor Lesqu.ereux^ 

 have led me to the conclusion that the figured originals, all of which are 

 said to have come from Cannelton, Pennsylvania, are specifically distinct 

 from the examples from Missouri, even those labeled by the author. 



' Coal Flora, vol. iii, p. 781, pi. cv, figs. \-i. 



