52 E. W. Berry — Late Lower Cretaceous. 



Marchantia oolithius Fliche & Bleicher 5 and Marcliantites 

 erectus (Leckenby) Seward 6 , and the last named author 

 has described Marcliantites ZelllerV from the English 

 YTealden. 



The Pat ap sco form is very much like the \Yealden 

 species Marcliantites Zeilleri and may possibly be identi- 

 cal with it despite the difference in age and the geograph- 

 ical remoteness of the two. I have ventured to name the 

 American form in honor of Professor Seward who has 

 done so much to elucidate the Mesozoic floras of the Old 

 World. Beginning with the Eocene a considerable num- 

 ber of Tertiary forms of liverworts, some showing traces 

 of their fruiting organs, have been found. 



The Jolms Hopkins University, 

 Baltimore, Md., XL S. A. 



5 Fliehe & Bleicher: Bull. Soc. Sei. Nancy, ser. 2, tome 5, p. 67, fig. 1, 

 1881. 



6 Seward, A. C. : Jurassic Flora, pt. 1, p. 49, pi. 19, fig. 2, 1900. 



7 Seward, A. 0. : Wealden Flora, pt, 1, p. 18, pi. 1, fig. 3, 1894. 



EXPLANATION OF FIGUKES. 



Fig. 1. Ruffordia acrodentata (Fontaine) Berry. 



Fig. 2. Marcliantites Sewardi Berry, sp. nov. 



Fig. 3. Tubers of Equisetum Burchardti (Dunker) Brongniart. 



Fig. 4. Nodes with leaf sheaths of Equisetum Burchardti, X 3. 



Fig. o. Twig of Celastrophyllum latifolium Fontaine. 



