827 



Ptilo. 



Ind. tZ^Z 

 Ohio and Indiana. 



frond magniAed to show structure. Dayton yellow limestone 

 formation, {^omihlj Niagara. Collett.) V a, (Vb?) 

 Ptilodictya falciformis. Nicholson. Collett's Indiana 



Keport of 1882, page 265, 

 plate 12. fig. 1, a frond of 

 this bryozoon, natural size. 

 Hudson river formation in 

 Pal. Ohio, Vol. 2, 1875, page 259, plate 25, 

 fig. 7, a small example of natural 

 size ; 7«, enlarged cross section ; 

 7J, much magnified portion of sur- 

 face. Nicholson has seen wider 

 fronds. Allied to HalPs P, {Esch- 

 ar opor a) recta^ on the one hand, 

 and to Goldfuss' P. lanceolata 

 Billings' P. gladiola^ and P, sul- 

 cata^ on the other. Not uncom- 

 Pcii.OhTSTvolJj.fL^txv. mon near Cincinnati, O. — IIIl, 



Ptilodictya fenestelliformis, Nicholson, Pal. Ohio, Vol. 



2, 1875, page 263, plate 25, fig. 

 8, nat. size,, small fragment; 

 8t«, enlarged cross section; 5, 

 magnified cell surface, with one 

 of the spots without cells. 

 Easilyrmistaken for a Fenes- 

 iella\;^rm^i be mistaken for 

 a Chcetetes [{ Monticulipora) ; 



but its internal structure shows it to be a genuine Ptilodictya. 



Hudson river strata at Cincinnati, O. Ill b. 



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



page 262, plate 25, fig. 4, 7iat size^ frond 

 broken above ; a, cross section enlarged ; 5, 

 magnified portion of frond. Smaller, nar- 

 rower and more bent than P. gladiola,, Bil- 

 lings. Lebanon, O. Hudson river strata. 

 Ill b. 







1 



W- *• »i 5 ^ "^Mm^^^r .^-.^ ; 





PoXOWio. 





^^^ 



Ptilodictya gilberti. See Stictopora gilberti. VIII a. 

 Ptilodictya labyrinthica. See Stictopora labyr. II c. 



