FOSSIL PLANTS. 453 



arched in the lower part, marked in the middle by three equal 

 small points, and overtopped by a pointed crown; tubercles 

 none, appendages marginal. A fine species found at Murphys- 

 boro, Jackson county. Coal No. 1 B. 



Lepidodendron turbma&wm, Sp. nov. PL 44, fig. 6. Cica- 

 trices very inflated, obovate, obtuse at both ends, rugose near 

 the base, encircled with a high, smooth, obtuse, broad margin ; 

 vascular scars obscure, placed at the top of the cicatrices, broad, 

 acute on the sides, slightly emarginate above, very obtuse 

 below, marked with three points, without tubercules or append- 

 ages. Locality : Carroll's place, Pope county; Chester group. 



Lepidodendron costatum, Sp. nov. PI. 44, fig. 7. Cicatrices 

 scarcely marked if at all; apparently oval, wrinkled, flat, sepa- 

 rated by a rugose half an inch broad, straight contiguous mar- 

 gin, resembling the intermediate ribs of a Sigillaria. Vascular 

 scars deeply and broadly notched above, arched below, angular 

 on the sides, marked in the middle by two large external points, 

 and a smaller medial one; appendages long and well marked; 

 crown a large oval point. A beautiful species, found also at 

 Carroll's place, under the Upper Archimedes limestone. Ches- 

 ter group. 



I was at first inclined to consider the three last named spe- 

 cies as representing different forms of the same, at different 

 stages of the growth of the plant; but there is too much differ- 

 ence in the form of the cicatrices. Should other specimens of 

 these species support the first supposition, the two last forms 

 may be described as varieties, and the specific name, Lepido- 

 dendron Worthenii, preserved. It is but just that such a fine 

 species bears the name of Prof. A. H. Worthen, who has done 

 so much for the Paleeontology of the West by his indefatiga- 

 ble researches. 



Lepidodendron obscurum, Sp. nov. PI. 44, fig. 1 to 3. Cica- 

 trices flat, rhomboidal, obscurely marked, distant and separated 

 by longitudinal, deep, slightly undulate strise, becoming more 



