462 PALAEONTOLOGY OP ILLINOIS. 



GENUS CARPOLITHES, Sternb. 



111. Geol. Rep., vol. ii, p. 460. 



CARPOLITHES CORTICOSUS, Sp. nov. 



PI. xxxi, fig. 17. 







A SMALL flattened nutlet, oval, short pointed at one end, 

 (the point turned on one side) and covered with a thin yel- 

 lowish meinbranaceous pellicle. It is surrounded by a pro- 

 portionately thick pericarp, having the same form, and being 

 a compound of crystallized iron. 



Mazon creek ; in concretions. 



CARPOLITHES PERSICARIA, Sp. nov. 



PL xxxi, fig. 18. 



A SMALL fruit, one-half of an inch long, only half as broad, 

 oval elongated, pointed at one end, slightly emarginate at the 

 other, with a thick exocarp, and an internal compound of the 

 same form, but of a softer substance. The outer wall is pre- 

 served, while the internal part is nearly destroyed. It resem- 

 bles a small kernel of a peach. 



On shale found at Murphysborough ; and poorly preserved. 



CARPOLITHES VESICULARIS, Sp. nov. 



PL xxxi, fig. 19 to 21. 



THIS kind of fruit resembles a small bladder, which, by com- 

 pression in various ways, has taken different forms. It is gen- 

 erally elongated, more inflated and obtuse on one side than on 

 the other, cylindrical. Its surface is smooth, generally cov- 

 ered with a thin coating of coaly matter, marked with broad 

 wrinkles and undulations, as in fig. 19. Fig. 21 shows a kind 



