173 



ranges of apertures separated b}' longitudinal ridges, wliifli 

 often continue out on the non-celluliferous sjjaces. 



Found in the Encrinal 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 Pleurodictinm beds 

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

 Shore and in Avery's Creek (often al)undant). 



Sti(;topora sinfosa. Hall. (Fig. CxS.) ( Pal. N. V.. Vol. 

 YL, p. 247, PI. LXI.) 



Distinguishing Cliaracters. — Broad- 

 ly oval to nearly circular, distant, 

 apertures; sti'ong })eristomes, more 

 elevated on pcjsterior part ; strong, 

 sinuons interrupted ridges between 

 the apertures. 



Found two feet below lowest Trilo- 

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



Stictopoua kecta. Hall. (Pal. X. Y.. Vol. VI.. ]). 253.) 

 (Not figured. ) 



Distinguishing Ch ^i rn c - 

 tnrs. — \Vidth of branches 

 from 1 to 1.2") mm.: paral- 

 lel margins: no expansion 

 before bifui'cating: narrow 

 or obsolete n o n - c e 1 1 u 1 i f - 

 erous space; bifurcations at 

 intervals of about 6 mm., 

 branches diverain 

 of fort 



apertures in five or six paral 

 lei longituilinal rows, se|)a- 

 rated by less than length of 

 apertures; ])rominent gran- 

 nlose or nodulose i-idges 

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

 (piently obscuring them: numerous irregularly (hs]>osed 

 granules. 





Fic tls. stii-tdjioni Kiinuisa. 

 Portion of surface enlartjed, x 

 18 (after Hall and Simpson). 



■ '■■'" '^ f ''■' -^ f i^' •■»^. 



■f, 



#'■ 





),'■ ' 





es diverging at angle ^H^ '. If '^ |f ■>: ' <j 'V"^f 

 :v-five de<>:rees: oval f;:^^:^^ ,'■ ,- * l^,t.:-:':v 





Fig. 69. Stictopora palmipca. Natural 

 size, and a portion enlarged, x 18 lafter Hall 

 and Simpson). 



