174 



Found ill the "Hamilton j^rou}), at West Hamburg, Erie 

 County, N.Y." (Hall.) 



Stictopora PALMiPES. Hall. (Fig. 69.) (Pal. N. Y., Yol. 

 YI.,p. 255, PL LX.) 



Distinguishing Characters. — Small size: intermediate, lat- 

 eral, palmate branches or lobed expansions between regular 

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

 apertures; slight peristomes; strongly nodose longitudinal 

 ridges. 



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

 burg, Erie County, N. Y." ( Hall, type.) 



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

 N. Y., Yol. YI., ].. 258, PI. LXIII.) 



Dis tinguisliing ( 'ham cters. — Narrow 

 or obsolete non-celluliferous margins; 

 oval cross-section ; thick ])eristomes of 

 irregularly scattered apertures; absence 

 of ridges. 



Found in the ••plamilton group, at 

 Fig. 70 Stictopora per- West Hamburg, EHe Countv, N. Y." 



marginata. Portion en- o ' „ ' 



larged, X 18 (after Hall and (Uoll ^1^,10^ 

 Simpson). (nail, LNpt^-^ 



Genus T.FXIOPOKA. Nicholson. 



[Ety. : Taiida, ribbon; poros, pore.] 

 (1874: Geol. Mag. Lond. X. S., Vol. I., p. 120.) 



Bryozoum consisting of narrow flattened branches, which 

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

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

 nent longitudinal keel, while the cell apertures are more 

 ])rominent than in Stictopora. 



T.icxiopora exigua. Nicholson. (Fig. 71.) (Pal. N. Y., 

 Yol. YI., p. 263, PI. LXII.) 



Distinguishing Characters. — Comparatively wide non- 

 celluliferous margin: strong central, and similar lateral 

 (branch) ridges; minute circular apertui-es; j)i-omineiit peri- 

 stomes. 



i 



