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; pi. xxxix, figs. 1-3. 
Fenestella. ( Polypora ) hexagonalis, pi. xxxviii, figs. 14-20. 
Ptiloporella, s. g., Hall (Report of State Geologist for 1884, p. 36. 1885). 
[Type, Fenestella (Ptiloporella) laticrescens, Hall.] 
Bryozoum growing in the same manner as Ptyloporina, 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 base, and having lateral branches connected by dissepiments. 
Examples: Ptilopora striata, pi. lxvi, figs. 30-33. 
Ptilopora infrequens, pi. lxvi, figs. 26-29. 
Glauconome, Goldfuss (Petrefacta Germanise, 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. lxvi, figs. 23, 24. 
