173 



Fio. 68. Stictopora sinuosa. 

 Portion of surface enlarged, x 

 18 (after Hall and Simpson). 



ranges of apertures separated by longitudinal ridges, which 

 often continue out on the non-eelluliferous spaces. 



Found in the Enerinal limestone (rare); in the Stictopora 

 bed, at Section 5, etc. (abundant) ; in the Demissa bed (com- 

 mon) ; in the shale down to and in the Plenrodictium beds 

 and the shales below, at Sections 5 to 8; and on the Lake 

 Shore and in Avery's Creek (often abundant). 



Stictopora. sinuosa. Hall. (Fig. 68.) ( Pal. N. Y., Vol. 

 VI., p. 247, PI. LXI.) 



Distinguish ing Chara cters. — Broad- 

 ly oval to nearly circular, distant, 

 apertures; strong peristomes, more 

 elevated on posterior part; strong, 

 sinuous interrupted ridges between 

 the apertures. 



Found two feet below lowest Trilo- 

 bite bed, in Avery's Creek (one specimen). 



Stictopora kecta. Hall. (Pal. N. Y., Vol. VI., p. 253.) 

 (Not figured. ) 



Distinguishing Ch a r a c - 

 ters. — Width of branches 

 from 1 to 1.25 mm.; paral- 

 lel margins ; no expansion 

 before bifurcating; narrow 

 or obsolete non-cellulif- 

 erous space; bifurcations at 

 intervals of about 6 mm., 

 branches diverging at angle 

 of forty-five degrees; oval 

 apertures in five or six paral- 

 lel longitudinal rows, sepa- 

 rated by less than length of 

 apertures; prominent gran- 

 ulose or nodulose ridges 

 separating rows, equal in width to apertures, and fre- 

 quently obscuring them; numerous irregularly disposed 

 granules. 





m,m IP* 



■fp^'Sr- r # .v 





Fig. 69. Stictopora palmipes. Natural 

 size, and a portion enlarged, x 18 (after Hall 

 and Simpson). 



