177 



Glauconome carinata. Hall. (Fig. 74.) (Pal. N. Y., 

 Vol. VI., p. 278, PI. LXVI.) 



Distinguishing Characters. — Small size; broad central 

 rachis; thin, short, lateral branches; flattened, non-cellulif- 

 erons face, with three prominent ridges or carina-; circular 

 apertures; comparatively strong peristomes; prominent 

 carina between ranges of apertures. 



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

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



Genus BOTRYLLOPORA. Nicholson. 



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

 (1874: Geol. Mag. 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, which is covered by a con- 

 centrically wrinkled epitheca. The cells are tubular and 

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

 ating ridges. Central de- 

 pressed space of the body 

 non-celluliferous. 



BoTRYLLOPORA SOCIALIS. 



Nicholson. (Fig. 75.) (Pal. 

 N. Y., Vol. VI., p. 282, PI. 

 LXIY.) 



Distinguishing C 'h 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). Bemissa bed, 

 at Section 5 (rare). 



Fig. 75. Botryllopora social is. Portion 

 of a colouy enlarged (afttr Hall and 

 Simpson). 



