1 



Glai'("C)X()Mi: cARiXATA. Hall. (Fig". 74.) {V,\\. X. Y., 

 Vol. VI., p. '27:\, PI. LXVI.) 



Distinguishing- Clmnivters. — Small size; ])1'0{k1 central 

 nichis; thin, short, lateral branches; flattened, non-cellnlif- 

 erons face, with three prominent ridges or carin^e; circular 

 apertures; comparatively strong- peristomes; prominent 

 carina between i-anges of apertures. 



Found in the "Hamilton Group, in Fighteen Mile Creek, 

 Erie County, X. Y." (Hall, type.) 



Genus BOTRYLLOPORA. Nicholsox. 



[Ety. : Botryllos, cluster; jwros, pore.] 

 (1874: Geol. 3Iag. N. S., Vol. I., p. 160.) 



Bryozoum consisting of small discoidal bodies, which 

 occur either singly or in clusters, and adhere to foreign 

 bodies by their under surface, Avhich is covered by a con- 

 centrically wrinkled epitheca. The cells are tubular and 

 rectangular to the surface, in double rows, formino- radi- 

 ating ridges. Central de- 

 pressed space of the body 

 non-cellulifei'ous. 



BOTKVLLOPOKA SOCIALIS. 



Nicholson. (Fig. 75.) (Pal. 

 X. Y., Vol. VI., ]). 282. PI. 

 LXIV. ) 



Distinguishing L 'li a rac- 

 ters. — Alternate ridges ex- 

 tending to central area, 

 others one-half to two-thirds 

 that distance; minute circular apertures often in contact or 

 inosculating. 



Found in the shale below the Trilobite beds, in Avery's 

 Creek, and on the Lake Shore (not common). Demissa bed, 

 at Section 5 (rare). 



Fig. 75. Botryllopora sncialis. Portion 

 of a colouy enlarged (after Hall and 

 Simpsonj). 



