XXII 
SYNOPSIS OF GENERA. 
Semiopora, Hall (Trans. Albany institute, vol. x, p. 193. 1881). 
[Type, Semiopora bistigmata, Hall.] 
Zoarium ramose, flattened, growing from a spreading base. Branches cellu- 
liferous on both sides ; cells arising from a mesotheca. Apertures separated 
longitudinally by two minute pits or mesopores. 
Example: Semiopora bistigmata, pi. lxii, figs. 27-29. 
Intrapora, Hall (Trans. Albany Institute, p. 157. 1881). 
[Type, Intrapora puteolata, Hall.] 
Zoarium as in Stictopora. Interapertural space occupied by minute angular 
pits. Intercellular structure irregularly vesiculose. 
Example: Intrapora puteolata, pi. xxix, figs. 18-26. 
Thamniscus, King (An. Mag. Nat. Hist., 2d ser., vol. iii, p. 389. 1849). 
[Type, Ceratophytes dubius, Schlotheim.] 
Zoarium ramose, growing in flattened or infundibuliform fronds. Branches 
frequently bifurcating, not anastomosing or connected by dissepiments, cellu- 
liferous on one side. Cells tubular. Apertures circular or oval, sometimes 
polygonal 
Examples: Thamniscus variolata, pi. xxii, figs. 34-46. 
Thamniscus multiramus, pi. xxxiii, figs. 1-5. 
Fenestella, Lonsdale (Murchison’s Silurian System, p. 677. 1839). 
[Type, Gorgonia antiqua, Goldfuss.J 
Bryozoum ramose, forming flabellate or infundibuliform fronds, composed of 
slender branches celluliferous on one side, connected by transverse processes 
or dissepiments. Cell apertures in two ranges, separated by a carina or line 
of nodes. 
Examples: Fenestella Sylvia, pi. xx, figs. 4-7. 
Fenestella variapora, pi. xlv, figs. 1-13 ; pi. xxxv, fig. 17. 
Fenestrapora, s. g., Hall (Report of State Geologist for 1884, p. 36. 1885). 
[Type, Fenestrapora biperforata, Hall.] 
Bryozoum infundibuliform, branches connected by dissepiments. Cell aper¬ 
tures in two ranges, separated by a carina bearing pores. Non-celluliferous 
face with conspicuous pores. 
Example: Fenestrapora biperforata, pi. lxvi, figs. 34-39. 
