no. lrt39. A NEW FOSSIL LIVERWORT KNOWLTON. 159 



and in fruit in the travertines (Eocene) of Sezanne. This species. 

 which Saporta also compares with M. polymorph^ is similar to M. 

 pealei, though it is considerably smaller, and differs slightly in the 

 character of the margin, while the areolation of the thallus appears 

 to have been very well preserved. As this feature was not preserved 

 in the Miles City specimen, it would be necessary to keep them dis- 

 tinct for the present if for no other reason. It is not necessary to 

 speak of the fruit of M. sezannensis, since the fruit has not been 

 found in M. pealei. 



In concluding it may be pointed out that it seems a rather singu- 

 lar fact that the two authentic examples of fossil Hepaticse thus far 

 found in this country should both have come from the same part of 

 the Fort Union beds of Montana. 



