PLATE 69 A. 



Fig. 1. 317. 5. BuTHOTREPHis flexuosa. (Pag. 263.) 



A fragment of slate from Greenwich in Washington county, with a nearly entire specimen of this plant, which 

 presents some slight differences from the preceding one. Specimens of the same species have recently 

 been obtained from the unaltered slates of the Hudson-river group in Lewis county. 



