438 PALAEONTOLOGY OF ILLINOIS. 



ULODENDRON PUNCTATUM, Sternb. Vers. 2, p. 186. 



Tab. 45, fig. 1, a-e. 



I refer to this species, though with some doubt, a beautiful and well preserved 

 specimen, lately communicated by Mr. John Collet, from the Mahoning sand, 

 stone? of Clinton, Vermilion county, Ind., near the limits of the State of Illi- 

 nois. The specimen represents a branch compressed into an oval shape and 

 slightly arched, three and three-fourths inches broad across in its broadest 

 diameter, two and a-half inches in the narrowest compressed part, its upper 

 cortex marked by small, oval, convex-pointed intumescences, with a small oval, 

 deeply concave scar at the point, placed in spiral at about one line distance from 

 each other. The upper cortex is tormed by a pellicle of ferruginous, semi-car- 

 bonaceous hard matter, no thicker than a quarter of a line. Under it the surface 

 is marked with the same kind of cicatrices, but the top oval scars are oblitera- 

 ted. On both sides of the branches there are two longitudinal rows of strobile 

 scars, one and a-half inches distant from each other, a little less than one inch 

 broad, oval in outline, the center marked by a round cavity, from the bottom of 

 which a small mammilla protrudes. This is surmounted by an elevated margin 

 surrounded with round cicatrices like those of the bark. These branch or 

 strobile scars are alternate, five on one side, three on the other, horizontally 

 three inches distant in measuring across the upper broadest part of the branch, 

 and six inches in measuring on the other side across the more flattened part, 

 therefore appearing as placed in two rows on both sides and towards the supe- 

 rior part of the branches. The same configuration is remarked in Sternberg's 

 figure; but here the scars are placed along the concave border of the curved 

 branch, while in ours it is along its convex portion. The name of punctatum is 

 2;iven to the species from the points upon the branch scars, in the author's figure, 

 the cortex being marked by broadly triangular cicatrices. A few only of the 

 same form are perceptible at a single, small, decorticated spot near the most 

 erased part of our specimen, under a double layer of upper cortex. It appears, 

 therefore, that this specimen represents the same species in a better state of 

 preservation. Botliiodcndron punctatitm, LI. and Hutt., 2, p. 86, has the same 

 cortical cicatrices as ours, but differs by its long and more distant strobile 

 scars. 



Morris, on shales. 



