462 
PALEONTOLOGY OF ILLINOIS. 
Genus CARPOLITHES, Sternb. 
Ill. Geol. Rep., vol. ii, p. 460. 
Carpolithes corticosus, Sp. nov. 
PI. xxxi, fig. 1Y. 
A small flattened nutlet, oval, short pointed at one end, 
(the point turned on one side) and covered with a thin yel¬ 
lowish membranaceous 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. 
PI. 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. 
PI. 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 
