172 



Distinguishing Characters. — Free or Lncrusting lamellate 



expansions, or masses, formed by superposition of successive 



Cr t layers of growth; tubular cells, 



«& e «->. C%'.&%± recumbent for a short distance, but 



chiefly al right angles or oblique to 

 1 or nearly circular 

 , usually a little ob- 

 que to me surface; prominent 

 f"$&^& rounded monticules, bearing an 

 elongate depression m the center, 

 which is destitute of cells ; large cell 

 apertures adjacent to the depres- 

 sions; radiating rows of apertures, 

 '","'"« giving the monticules a stellate 



surface enlarged, xo & o 



appearance. 

 Found in the Demissa bed of Section-") (massivespecimens). 





mm 



^tPk 





Fig. 66A. 

 Portion of the 



l.'itt.-r Hall and Simpson), 



Genus STICTOPORA. Hall. 



(1847: Pal. N. Y., Vol. I., p. TS.) 

 [Ety. : 8ticto8, punctured ; poi'os, pore.] 



Bryozoum consisting of thin, flat branches with a lenticu- 

 lar cross-section, and attached by a spreading base to for- 

 eign objects. Cells in two series, separated by a median wall 



or mesotheca, each series 

 having its apertures on one 

 of the flat sides. Margin 

 without cells. 



Stictopoka incisurata. 

 Hall. (Fig. 67.) (Pal. 

 X. Y.. Vol. VI., p. 241, PL 

 LX.) 



Distinguishing Ch arac- 

 ters. — Elongate oval to 

 nearly circular apertures in 

 longitudinal diverging lines, increasing by interstitial ad- 

 ditions; marginal apertures largest; peristomes strong; 



I H. 67. Stictopora incisurata. Natural 

 Size and a portion i-nlaiK ,, 'l latter Hall and 

 Bimpson 



