﻿Fucoids of the Cincinnati Group. 



157 



The other four species, viz., G simiUs, and G Grenvilensis, Billings, 

 from Canada, and G Linnarsoni, and G rustica, White, from Arizona, 

 are likewise trails of some sort, but not having been found in this vicinity, 

 do not at present come under consideration. 



Here now in this genus there are eight species which have been referred 

 to the Algae, and which can be disposed of as follows : 



Cruziana (Rusophycus) pudica, Hall. Crustacean Trail. 



C (JR.) bilobata, Hall. 



C (R.) grenvilensis, Billings " " 



C. similis, Billings. " " 



C rustica, White. " 11 



C: Linnarsoni, White. " " 



C. (R.) subangulata, Hall. G-asteropod trail. 



(Syn. R. clavatum, Hall). 

 C aspera, S. A. M. Burrow. 



Lastly, Cruziana Carleyi, n. sp., is propably the trail of an AsapJius. 

 Genus Saccophycus, James. 1879. 



This genus was established by Mr. U. P. James, in the Palaeontologist, 

 p. 17, for a fossil with an "eneven, undulating surface, smooth or 

 striated longitudinally," "the sides or ends rounded and drawn in and 

 under." One species, S. intortum, was described. In the absence of figure 

 or specimen, (only the type having been found), it is difficult to decide 

 what this may have been. But from the description it is inferred that it 

 is the burrow of an annelid instead of a fossil plant. 



Genus Pal^eophyctts, Hall. 1847. 



The genus Palscophycus was characterized by Hall, in Yol. I., Palae- 

 ontology of New York, p. 7, as having a terete, simple or branched, 

 cylindric or sub-cylindric stem, the surface nearly smooth, without trans- 

 verse ridges, and apparently hollow. A large number of species have 

 been referred to the genus and considered as plants, but it is doubtful if a 

 single one of them is a true Alga. From the rocks of this vicinity five 

 species have been recognized, and these are arranged as follows : 



Palceophycus fexuosus, James, has already been shown to be a ripple 

 mark. (This Journal, Vol. VII., p. 129). 



P. tubular e, Hall, is described as having a tapering cylindric stem, bent, 

 flexuous and branched ; the surface nearly smooth and the branches gen- 

 erally compressed. 



P. rugosus, Hall, has a sub-oylindrical stem, with divergent cylindrical 

 branches. The surface is very rugose, and the branches are flexuous. 



