OF ARKANSAS. 311 



high as "broad, emarginate, cordate above, round obtuse below, with obtuse 

 lateral angles. Vascular scars three, the medial one semilunar or round, 

 the lateral ones straight or scarcely arched. Habitat, Male's coal-bank. 



9. Halonia pulchella, Sp. nov. (PI. 3, fig. 3). Stem apparently slender, 

 straight, scarcely branching, marked by small elevated points or tubercles. 

 Among the few species which have been published of this genus, and which 

 apparently all belong to the subconglomerate coal, none presents as fine 

 and as regular an appearance as this in the disposition of the tubercles. 

 The depression marked at a is apparently the place of a branch. Locality : 

 Male's coal-bank. 



10. Diplotegium truncatum, Sp. nov. (PL 4, fig. 1). Stem apparently 

 broad, marked by elevated, half-round, elongated, truncate scars, which are 

 the base of broken leaves. These scars are regularly placed in spiral J 

 rows. This species could be referred to a Knorria but for the abrupt and 

 irregular fracture of the point of the scars. Locality: Male's coal-bank. 



11. Lepidodendron diplotegioides, Sp. nov. (PI. 4, fig. 2). In Mr. Corda's 

 description of Diplotegium Brownianum, the decorticated part of the stem 

 shows rhomboidal scars somewhat resembling those of this figure. It may 

 thus be that the specimen described here is referable to the former species 

 though the scars are very different. They appear related to a true Lepido- 

 dendron, nearly related indeed by the central scar to Lepidodendron sigilla- 

 rioides, Lsqx. Till some better specimens are found, the name can be pre- 

 served. Found in the shales of Frog-bayou coal-bank. 



12. Lepidophloios . irregularis, Sp. nov. (PI. 4, fig. 3.) Stem tree-like; 

 bark covered with scales left by the base of the deciduous leaves ; scars 

 rhomboidal, irregularly placed and of various size, with a broadly rhom- 

 boidal small scar at its upper part, showing the place of attachment of the 

 leaves, and marked by three vascular points. The specimen figured here 

 is the only part found at Male's coal, except a still smaller specimen found 

 at James's Fork of Poteau. The scales either covering part of the scars, 

 or detached, are visible enough, apparently lacerated and reflexed. But 

 the irregularity of the scars may be due to a mechanical action of com- 

 pression or decomposition, and a larger piece of the species would be 

 needed to indicate its true characters. 



13. Cardiocarpon ingens, Sp. nov. (PL 4, iig. 4, and 4 a.) A large and 

 beautiful fruit, heart-shaped in its general outline, deeply notched at the 

 point and surrounded by a broad, narrowly striated margin. Though fig. 

 4 a is more pointed, it appears to represent the same species as fig. 4. Both 

 were found at Male's coal, and a specimen like fig. 4 was found also at 

 Frog Bayou. 



14. Cardiocarpon affine, Sp. nov. (PL 4, fig. 5.) Perhaps this species 

 represents an unripe or undeveloped state of the former. It is rounded at 

 the base, pointed at the top, marked by a cordiform, basilar depression 



