520 PROCEEDINGS OP THE ACADEMY OF 



This handsome and distinct species was discovered at Ashland, Schuylkill 

 County, Pa., by Mr. T. Guilford Smith, and by him presented to the Academy. 



L. chilalloeum, nobis. 



Leaf scar sub-oval, elongate and acuminate above and below, often com- 

 municating one with another ; margins distinct, broad, alternately contracted 

 and enlarged for half the length of the scar ; vascular scar sub-rhomboidal, 

 their transverse diameter very much exceeding their height, (sometimes four 

 times as great); internal markings and appendices obsolete ; medial line, above 

 the vascular scar, well marked and furnished with a triangular depression, 

 below, almost obsolete, but crossed by a number of heavy transverse wrinkles. 



The form of the ribs ally this plant to L. dicrochilum, nobis, but the 

 internal markings as well as shape of main scar widely separate it from that 

 species. 



L. salebrosum, nobis. 



Leaf scar rhomboidal, uneven ; margin heavy, raised, irregularly plicate, 

 quite flexuous ; angles sometimes rounded, sometimes acute ; medial vascular 

 cicatrix sub-central, small, in one scar in our specimen marked with two 

 very much raised lines, in the form of a cross, (this may be accidental) ; ap- 

 pendices and medial line obsolete. 



Cabinet of the Academy. Locality unkown. 



L. uraeum, nobis. 



Scars elliptical, very much elongate, caudate and slightly curved above and 

 below, impressed with flexuous transverse wrinkles disposed with some ap- 

 proach to regularity ; margin raised, very narrow, almost linear ; vascular 

 scar sub-rhomboidal or snbtriangular, (in the one case having the basal angle 

 acute, in the other, the base merely convex, remaining angles being mostly 

 obtuse), situated a little above the centre of the main scar, impressed with 

 three dots arranged in a curve near its base ; medial line not very distinct, but 

 running the whole length of the leaf scar above the cicatriculus smooth and 

 furnished with a triangular expansion approaching in size to the vascular scar 

 below the cicatriculus crossed by many heavy transverse flexuous wrinkles ; 

 appendices subdistinct, irregularly curved and of considerable length ; tuber- 

 cles oval, elongate, somewhat acuminate, situated at base of vascular scar, 

 "and close to the medial line. 



In our specimen the total length of the leaf scar is 2 9-10ths inches, being five 

 times as great as its breadth. The vascular scar is placed somewhat obliquely in 

 the main scar. At the extremities of the latter, the two margins are so ap- 

 proximated as to be merely separated by a groove. This species is, perhaps, 

 closely allied to L. caudatum, Ung. We have never seen Sternberg's 

 figure of that plant, and Unger's description is excessively meagre : but out of 

 the few given characters our specimen differs in the great rugosity of the medial 

 line, as well as in the obtuseness of the angles of the cicatriculus. We may 

 be mistaken in our idea as to the relationship of the two plants, as Unger's 

 description leaves one so much in the dark. 



Private collection. Found by Mr. John Fulton in the Broad Top Coal Field, 

 where it appears not to be uncommon. 



Sigillakia, Brongt. 



Sub- genus Rhytidolepis. 



S. cymatoides, nobis. 



Stem costate ; costse narrow, convex ; furrows very distinct, marked in decor- 

 ticated state, with numerous longitudinal striae, which are also found more or 

 less deeply excavated on the ribs ; scars somewhat elongate, as wide as the 

 ribs, disposed in quincunx, the space between them being a little less than 

 half their length, impressed with very numerous transverse striae, their lower 



[Nov. 



