Contributions to Pala'ontoloyy. 25 



diagonal or longitudinal markings, as if made by the folding down of 

 hair-like filaments. The markings readily distinguish it from all other 

 genera of Silurian plants. 



Trichopycus lanosus, u. sp. (Plate I., figs. 3 and 4.) 



[Etj .—Lanoms, -woolly.] 



Plant consisting of a round, flexuous stem, having an enlargement 

 or spheroidal swelling at one end, and being covered with diagonal and 

 longitudinal lines, as if made by the folding down of hair-like filaments. 

 Figure 3 illustrates well the appearance of the fossil and the enlarge- 

 ment at one end. Figure 4 represents part of three specimens lying 

 together on a slab. 



The specimens figured are from the collection of C. B. Dyer, and 

 were found in the upper part of the Cincinnati Group, in Warren coun- 

 t}', Ohio. 



RusoPHYCUs ASPER, u. sp. (Plate I., fig. 5, natural size; fig. ca, 

 magnified view.) 



[Ety. — Asper, rough.] 



This plant consists of long stems, flattened on the upper side, or hav- 

 ing a longitudinal depression, which gives to them a subangular out- 

 line. The surface is made very rough b}^ numerous papillae, many of 

 which are transversely elongated. The stems are found thrown across 

 each other in various directions, but none of them have been observed 

 to branch. We are inclined to think, however, that it is a branching 

 fucoid, though it maj' reall}'' be, as observed, composed only of simple 

 stems. 



It is so easily distinguished by its surface markings, from all other 

 species in this genus, that no comparison with ^ny of them is neces- 

 sary. We iDrefer to refer the species to this genus, rather than coin a 

 new name for it, though we are free to sa}- that, in our opinion, it is 

 separated by generic differences from such forms as R. pudicus, and 

 B. hilohatus. 



The specimen figured is from the collection of C. B. D^-er, and was 

 found at Cincinnati, in the lower part of the Group. 



LiCROPHTCUS FLABELLDM, U. Sp. (Plate II., fig. 4.) 

 ['Ety .—Flabellum, a fan.] 



This species consists of numerous ver}- long slender branches, spring- 

 ing from a common root or stem. Sometimes the branches appear to 

 be Ijing together in a bundle, and at other times the^^ are spread out 

 like a fan. All of these little branches are transverseh' wrinkled. In 

 one instance, where the root appeared to be about \ of an inch in di- 



