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A CONTIU BUTTON TO THE KNOWLEDGE OP 



or pit which is in all the leaf-scars much more strongly pronounced than the vascular 

 scar. 



L. salebrosum, Wood. Proc. A. N. S., vol. xii, 1860, p. 520. 



L. ciiiLALL/EUM, Wood. Leaf-scars oval, rhomboidal, acuminate at both ends, often 

 elongated into a narrow communicating channel ; margin distinct, broad, .slightly elevated, 

 alternately contracted and expanded for half the length of the scar; vascular scar deeply 

 sunken, sub-rhomboidal, the transverse diameter much exceeding the height, often four 

 times as great, without dots or internal markings ; triangular marking above vascular scar 

 distinct ; appendages faintly marked ; tubercles absent ; median line well marked above the 

 vascular scar, below almost obsolete but crossed by numerous very strongly pronounced 

 rugosities. 



L. chilallaium, Wood. Proc. A. N. S., vol. xii, 1860, p. 520. 



L. dicrocheilum, Wood. Cicatrices rhomboidal elliptical, with the apex and base 

 somewhat prolonged and acuminate, and the base flexuous; margin raised, broad, regu- 

 larly ftexuous; vascular scars sub-rhomboidal, with apex and base generally rounded and 

 lateral angles acute, situated a little above the centre, but markedly to one side; of the leaf- 

 scar, internally marked with three dots, surmounted with a somewhat semilunar impres- 

 sion ; the median line distinct, smooth ; tubercles and appendages wanting. 



L. dicrocheilum, Wood. Proc. A. N. S., vol. xii, 1860, p. 238. 



The margins of our specimens so bifurcate that one side receives an offset from the mar- 

 gin of the neighboring scar ; so that the margin for half the scar is alternately broad and 

 narrow ; thus the margin on the right hand side below is nearly twice the breadth of the 

 right hand upper margin. The total length of the leaf-scar is seven lines, the distance 

 from bottom of leaf to top of vascular scar five lines, from thence to top of leaf-scar two 

 lines. 



This species is very closely allied to Sagenaria dichotoma, Stcrnb., and if all the figure's 

 given in the Steinkohlcn Formation in Sachsen, of Geinitz, t. iii, are really one species, I 

 do not see how this can be retained as separate, although the shape of the vascular scar 

 differs somewhat. 



Hub. Broad Top. Hoof of Cook's (upper) seam. 



L. venustum, Wood. Cicatrices rhomboidal, with the bases and apices obtuse, rounded, 



