xxiv SYNOPSIS OF GENERA. 



Polypora, s. g., McCoy (Carboniferous Fossils of Ireland, p. 206. 1845). 

 [Type, Polypora dendroides, McCoy.] 

 Bryozoum similar to Ffnestella in its manner of growth and general charac- 

 ters, but having three or more ranges of cell apertures on the branches. 



Examples : Fenestella (Polypora) robusta, pi. xxxiv, figs. 4-7; pl.xxxix, figs. 1-3. 

 Fenestella (Polypora) hexagonalis, pi. xxxviii, figs. 14-20. 



Ptiloporella, s. o.. Hall (Report of State Geologist for 1884, p. 36. 1885). 

 [Type, Fenestella (Ptiloporella) laticrescens. Hall.] 



Bryozoum growing in the same manner as Ptylopokina, but with only two 

 ranges of cell apertures on the branches. 



Example: Fenestella (Ptiloporella) laticrescens, not figured, p. 171. 



Ptiloporina, s. g., Hall (Report of State Geologist for 1884, p. 36. 1885). 

 [Type, Fenestella (Ptyloporina) conica, Hall.] 

 Bryozoum infundibuliform or flabellate, having some of the branches much 

 larger than the others. The ordinary branches- originate laterally from one 

 or both sides of the primary or larger branches, not bifurcating as in the 

 ordinary forms of Fenestella. Cell apertures in three or more ranges. 

 Examples : Fenestella (Ptiloporina) conica, pi. xliii, figs. 2-4. 

 Fenestella (Ptiloporina) sinistralis, pi. xliii, fig. 9. 



Ptilopora, McCoy (Synopsis, Carboniferous Fossils of Ireland, p. 200. 1844). 

 [Type, Retepora flustriformis, Phillips.] 

 Bryozoum flabellate, consisting of a primary stipe or rachis arising from a 

 spreading bsise, and having lateral branches connected by dissepiments. 

 Examples : Ptilopora striata, pi. Ixvi, figs. 30-33. 



Ptilopora infrequens, pi. Ixvi, figs. 26-29. 



Glauconome, Goldfuss (Petrefacta Germaniae, vol. 1, p. 100. 1826), as 

 emended by Lonsdale (Murchison's Silurian System, p. 677. 1839). 

 [Type, Glauconome disticha, Goldfuss.] 

 Zoarium consisting of a main stem or rachis from which proceed simple 

 lateral branches, at regular intervals, and occasionally branches having the 

 same manner of growth at the primary rachis ; celluliferous on one side. Cell 

 apertures in two ranges, often separated by a longitudinal carina. 

 Examples: Glauconome sinuosa, pi. xxxiii, figs. 11, 12. 

 Glauconome carinata, pi. Ixvi, figs. 23, 24. 



