436 PALAEONTOLOGY OF ILLINOIS. 



slightly inflated bolster, and topped by a small rhouiboidal leaf scar, marked 

 with three vascular points. The details characterizing this species, and which 

 have not been given by the authors, are represented in our plate 22, fig. 4. 

 The outline of the cicatrices differs indeed from that of the known species of 

 X/cpidodendron, and when the surface is somewhat erased, as in the part repre- 

 sented fig. 46, and as is generally the case on specimens of this species, it is un- 

 distinguishable from that of Sigillaria Menardi, Brgt. 



In its decorticated state the species equally preserves the appearance of a 

 Sigillaria^ its wrinkled surface beinir marked by mere semilunar, inflated dots, 

 as seen in fig. 4. The strobile scars are proportionally large, approximated to 

 each other, alternating in two vertical rows, nearly exactly round, or rather en- 

 larged horizontally. 



Mr. Jos. Even, of Morris, has kindly sent photographic plates of large spe- 

 cimens of his, which bear these strobile scars, one and a-half inches in diam- 

 eter, at a horizontal distance of three inches, and only one and a-half inches 

 from each other in vertical direction. The vertical distance of these scars is 

 apparently variable ; it is, however, generally shorter in this species than in 

 the following ones. 



On snales at Morris and Colchester. 



ULODENDRON ELLIPTICUM, Sternb. 



PL xxii, fig. 3, and PL xxiii, fig. 1 to 3. 



Under the name of H/epidodendron ornatfssimum, Prof. Brongniart has repre- 

 sented in his Foss. Flor., vol. 2, pi. 18, a large specimen of this species. As 

 there is not as yet a detailed description of it, and as the cicatrices of the sur- 

 face are not as clearly defined on the European specimens as on ours, I have 

 figured the essential parts of this species as exemplifications of its general ap- 

 pearance. 



The surface cicatrices are almost exactly rhomboidal, angular on the sides, 

 slightly elongated, more or less distant, with the leaf scar nearly central, 

 marked in the middle by a depression or small hollow, as indicating the place 

 of a single vascular scar. These scars arc not indicated by any of the Euro- 

 pean authors. It is probable that the two lateral ones are obliterated, but, 

 although a great number of specimens were carefully examined, they could not 

 be detected on any one of them. PI. 23, fig. 3 enlarged, shows the details of 

 the forms of these cicatrices. 



The strobile scars on this species are opposite to each other, vertically more 

 distant than in the former, or four to six inches, and horizontally six inches. 



