174 



Found in the "Hamilton group, at West Hamburg, Erie 

 County, N. Y." (Hall.) 



Stictopora palmipes. Hall. (Fig. 69.) (Pal. N. Y., Vol. 

 VI., p. 255, PI. LX.) 



Distinguishing Characters— SmaX] size; intermediate, lat- 

 eral, palmate branches orlobed expansions between regular 

 bifurcations, not over 1.50 mm. long by 1 mm. wide; oval 

 apertures; slight peristomes; strongly nodose longitudinal 

 i idges. 



Found in the "shales of Hamilton group, at West Ham- 

 burg, ErieCounty, X. V." (Hall, type.) 



Stictopora permarginata. Hall. (Fig. 70.) (Pal. 

 X. V.. Vol. VI.. p. 258, PL LXIII.) 



Dis ( inguish ing ( 'hara cters — Xa rro w 

 or obsolete non-celluliferous margins; 

 oval cross-section; thick peristomes of* 

 irregularly scattered apertures; absence 

 of ridges. 



Found in the ''Hamilton group, at 



Fig. 70. Stictopora per- West Hamburg, Erie CoUlltv, X. V." 

 margtnata. Portion en o» * > 



larged, x 18 (after Hall and |I4.,U f V np 1 



Simpson). I 11 '" 1 ' l . N l lc v 



Gems TiENIOPORA. Nicholson. 



[Ety. : Tairda, ribbon: poros, pore.] 

 (1874: Geol. Mag. Loud. N. S., Vol. I., p. 120.) 



Brvozoum consisting of narrow flattened branches, which 

 are often rhombic in cross-section. Cells on both sides, with 

 pounded apertures. In the center there is usually a promi- 

 nent longitudinal keel, while the cell apertures are more 

 prominenl than in Stictopora. 



T.KMoroiiA exigua. Xicholson. (Fig. 71.) (Pal. X. Y., 

 Vol. VI., p. 263, PI. LXII.) 



Distinguishing Characters. — Comparatively wide non- 

 celluliferous margin; strong central, and similar lateral 

 (branch) ridges: minute circular apertures; prominent peri- 

 ls tomi 





