174 NEW YORK STATE MUSEUM 



Clathropora frondosa Hall (Fig. 75) (1852. Pal. N. Y. 2:160, 

 pi. 40B, fig. 5a-e) 



Distinguishing characters. Reticulate, expanded, flabellate or fun- 

 nel-shaped frond, both surfaces regularly and equally celluliferous; 

 apertures rhomboidal or oblong quadrangular, opening obliquely 

 upward. 



Found in the Rochester shale at Lockport (Hall) and probably 

 also at Niagara. 



Clathropora alcicornis Hall (Fig. 76) (1852. Pal. N. Y. 2:159, 

 pi. 40B, fig. 4a-c) 



Distinguishing characters. Cylindric branches, bifurcating and 

 variously branched; entire surface celluliferous; apertures quad- 



f? 



V 



: ^ : ^ 



x 2 



ii ;$ ' 



Fig. 76 Clathropora alcicornis with enlargement 



rangular, rhomboidal or oblong and variable in form at the division 

 of the stem. 



Found in the lower Rochester shale up to and in the Bryozoa 

 bed at Niagara. Rare. Also at Lockport (Hall). 



Genus rhinopora Hall 



[Ety. : f>w6s; hide; xopos, pore] 



(1852. Pal: N. 7.2:48) 



Zoarium forming large, undulating bifoliate expansions, cellu- 

 liferous on both sides; surface usually smooth, rarely with solid 



