u 



VEGETABLE KINGDOM. 

 CLASS FUCOIDES. 



lU'SOPHYCrS CHESTERENSE, 11. sp. 



Plate T, -/'V'/. ], ahotciiKj three !i])ecii)U'iis on a slali. 



This plant as it apj^ears upon the slabs consists of elongated 

 subcylindrical stems somewhat flattened upon the upper side, and 

 having a longitudinal central depression, from which rounded ribs 

 are directed diagonally at either side. The diameter of a stem is 

 about half an inch, and there are about 10 rounded ribs on either 

 side of the depression in the distance of an incli. 



Found in the Kaskaskia Group, a( ("h(>ster. 111., and now in the 

 collection of W'm. F. E. (iurley. 



RfSOPHYCi:.S MONTAXENSE, 11. Sp. 



I 'Idle r, Fiji. ,?, shoining n specimen on <t sluh. 



This plant as it appears upon the slabs consists of siiniile elon- 

 gated subcylindrical stems, somewhat flattened upon tlie upper side, 

 and having a longitudinal central depression from which rounded 

 ribs are directed diagonally at either side. The diameter of a stem 

 is a little more than iialf an inch, and there are about 3 rounded 

 ribs on either side in the distance of half an imh. ( )ur two speci- 

 mens of this species area little larger than any of our specimens - 

 of li. citefilerense, and the diagonal rihs are less numerous. 

 These characters are .shown in the illustrat ions wjiich fully repre- 

 sent both species. Of course these differences might be regarded as 

 only of varietal value, but as the fossils are from different Groups of 

 rocks and therefore widely separated in geological time, we prefer to 

 distinguish them as species. 



Found in the Burlington (iroup, in Bridger Mountains, Montana, 

 by Earl Douglass, and now in the collection of S. A. Miller. 



