240 FLORA OF LOWER COAL MEASURES OP MISSOURL 



type of LepMophhios ? sigUlarioides Lx.^ Later I received from Dr. Britts, 

 through whose unfailing courtesies I have had the opportunity to study 

 many of the paleobotanical types from the Missouri Coal Measures, the 

 original type described and illustrated by Lesquereux. A comparison of 

 this type with the material labeled SigiUana Jissa, mentioned above, shows 

 at once not only that they all belong to the same species, but that the frag- 

 ments belong to the same individual, since No. 6660 is merely the adjoining 

 and contiguous segment of stem fitting against the type partially illustrated 

 as Leimhphloios sigUlarioides. The two fragments were either separated at 

 the time of collection or one was afterwards misplaced. Both of these frag- 

 ments, which may be treated as one, represent the impression of a trunk 

 12 cm. or more in width on the matrix. No. 6659, a portion of which is 

 shown in PL LXX, Fig. 2, is a fragment of that portion of the flattened 

 stem itself which made the impression just described, and when placed in 

 its original position it is fomid to lie across the line of fracture between No. 

 6660 and the type of the LepidopMoios, covering, in fact, a portion of both. 



The intimate relationship of the species in hand to Slgillaria campto- 

 tcenia is very obvious. The bolsters are distant and similar, though shorter 

 and proportionately wider in the material under consideration, there being 

 but little trace of the bolster below the inferior field. The outer sur- 

 face of the stem is finely shagreened, the longer axes being longitudinal. 

 There are even slight traces of an irregular, ropy striation comparable to 

 S. camptotcema, but the broad strands are low, when present, faint and 

 nearly vertical. As in the latter species, the leaf scars project beyond the 

 bolster, and are apparently epidermal in their connection ; but the scar is 

 more angular above, and, especially, rather narrowl}^ angular below, so 

 that the vertical diameter is proportionately much greater, the loAver mar- 

 o-ins being much more convex. The superior and inferior fields are much 

 broader vertically in 8. camptotmnia. In S. sigUlarioides the lateral cicatri- 

 cules are higher in the leaf scar, distinctly separate, and more arched. 



'Sigillaria fissa Lx., as described and figured from the Southern Antlu-a- 

 cite field of Pennsylvania,^ has the cortex marked in "narrow, undulate, 

 smooth lines," its scars " cordate," emarginate, and its punctiform vascular 



' Coal Flora, Atlas, p. 13, pi. Ixviii, figs. 8, 80; text, vol. il, p. 425. 



-Lesquereux, Proc. Boston Soc. N. H., vol. vi, 1854, p. 426; Geol. Peunsylvania, vol. ii, 2, 1858, 

 p. 871, pi. xiii, lig. 4. 



