448 PALAEONTOLOGY OF ILLINOIS. 



GENUS SYRINGODENDRON, Sternb. and Brgt. 



111. Geol. Report, TO!, ii, p. 451. 



SYRINGODENDRON PES-CAPREOLI, Sternb. 



Vers. 1,4 ; p. 24. 

 In shales at Gray ville ; collected by E. T. Cox. 



SYRINGODENDRON PORTERI, Sp. nov. 



PI. xxvii, fig. 4 to 6. 



STEM round and thick. (The State cabinet at Springfield 

 has a branch four inches in diameter, and another double this 

 thickness.) Surface covered with scars placed close to each 

 other in vertical rows, no more than one-sixth of an inch dis- 

 tant, the horizontal space between the rows double as large, 

 filled with vertical parallel and continuous lines or narrow 

 wrinkles close to each other. Scars small, scarcely one-twelfth 

 of an inch across, round, marked in the middle by a vascular 

 depression, overtopped by a convex or semi-lunar deep cavity, 

 which gives to the scars the appearance of an open eye, fig. 6. 

 This line either divides the round scar at its top, or passes 

 a little above it. These scars have the form of those on Syrin- 

 godendron cyclostigma, Brgt., and the strise of the surface are 

 also of the same kind in both species. 



But this species greatly differs by its closely approached scars, and especially 

 by the absence of the intermediate furrows. This character might even prevent 

 the admission of the species into this genus. If, as I am informed, there is a 

 specimen (which I have not seen), found in connection with those examined 

 for this description, and which is abruptly strangulated and reduced to half its 

 diameter, a form indicating a root rather than a branch, this species should be 

 admitted into the following genus. 



Found at Eugene, Ind., and presented to the State cabinet by Mr. Isaac 

 Porter. 



