Genera of the ISTorth American Palaeozoic Bryozoa. 697 



Sagenella, Hall. 



(Pal. K Y., Vol. II, p. 172. 1852.) 



Type, Sagenella membranacea, Hall. 



(Plate 20, fig. 4.) 



Zoarium a thin membraniform expansion, growing upon the 

 surface of other organic bodies cells subcylindrical, flattened 

 for the greater part of their length, and continuing nearly 

 parallel with the plane of the epitheca ; arranged in a more or 

 less regular diverging or radiating order, with intercalated ranges 

 presenting a subimbricated appearance, turning abruptly and 

 opening directly outward , cell apertures circular. 



Stomatcpora, Bronn. 



(System d. Urwelt; Pflanzenthiere. 1825.) 

 Type, Stomatopora dichoioma^ Bronn. 

 Zoarium adnate, cells subtubular, club shaped or ovate, not 



Fig. 202. Stomatopora inflata. Enlargement of diffei ent colonies, x9. 



Fig. 203, Three cells, x 18. 



Fig. 204. Vertical section of one of the cells, xl8. 



