452 PALEONTOLOGY OF ILLINOIS. 



arched lines, named appendages, and just under the scars, near 

 the middle, two oval, slightly diverging impressions, named 

 tubercles. The vascular scars are also sometimes overtopped 

 by triangular, trapezoidal or pointed marks, named the crown. 

 According to the form of the cicatrices, and the form and posi- 

 tion of the scars, this genus has been divided into four sections: 

 Lepidodendron, Sagenarm, Aspidaria and Bergeria, considered 

 by some authors as true genera. But as some of our American 

 species belong at the same time to at least two of these divis- 

 ions, according to their corticated and decorticated appearance, 

 I have not yet found the advantage of preserving any of them 

 for a classification. 



Lepidodendron diplotegioides, Lsqx. PL 49, fig. 2, and Geol. 

 Report of Ark., tab. 4, fig. 2. Stem apparently of small size; 

 cicatrices rhomboidal, obtuse on both sides, acute at both ends, 

 margin broad and smooth; vascular scars elliptical, enlarged 

 and acute at the sides, arched above, obtuse below, marked in 

 the middle by three oval, close, nearly continuous points ; 

 appendages and tubercles none; crown an irregular oval point; 

 medial line scarcely marked by a few deep wrinkles. In the 

 decorticated state the cicatrices are exactly rhomboidal, some- 

 what inflated, marked in the middle by a straight line, or an 

 elongated, deep point. Our specimen, which I found at Col- 

 chester, and which belongs to the State Cabinet, completes the 

 small decorticated specimen from the lower coal of Arkansas, 

 from which the species was established. It proves at the same 

 time that some species of Lepidodendron ascend from the coal 

 under the Conglomerate, as high as our coal No. 3. 



Lepidodendron Worthenii, Sp. nov. PI. 44, fig. 4 and 5. 

 Stem slender; cicatrices oblanceolate, narrowed and continu- 

 ous at the base, transversely much wrinkled, bordered with a 

 narrow, smooth margin. Vascular scars as broad as the cica- 

 trices, acute at both sides, emarginate above, very obtuse, 



