Ptilo. 



826 



Ptilodictya emacerata, Nicholson, Pal. Ohio, Vol. 2, 1875, 



page 261, plate 25, fig. 5, natural size 

 and enlarged fragment; 5a, enlarged 

 . cross section; 55, much magnified; 

 I from Hudson river strata at Cincin- 

 1 nati, O. Differs from P, fragilis^ Bil- 

 |||S lings, from Anticosti rocks of about 

 the same age, by its uniform littleness, 

 fewer rows of cells in a frond, and only one row of oblique 

 cells on each side ; perhaps it is only a variety. Illh 



Ptilodictya expansa. (See Pheenopora expansa, Hall 



fal.Ohco 



and Whitfield, Pal. Ohio, Vol. 2, p. 114, 1875. Flustra lanceo- 

 lata^ Goldfuss, quoted by VanCleveMSS., 1853.) Collett's In- 

 diana Report, 1882, page 266, plate 12, fig. 2 ( VanOleve) four 

 fronds of the bryozoon on one specimen; fig. 3, a part of one 



