Geneea of the JSTorth American Palaeozoic Bryozoa. 601 



Cyclopora, Prout. 

 (Trans. St. Louis Acad. Sci., Yol. I, p. 574. 1860.) 

 Type, Cyclopora fungia,\Tro\it. 



Zoaria consisting of lamellar or discoidal expansions ; incrust- 

 ing or free ; under surface an epitheca, concentrically wrinkled 

 and radially striated by the recumbent portion of the cell tubes. 

 Cells tubular, at first prostrate, then curving somewhat abruptly 

 and continuing rectangularly to the surface ; apertures subcircular 

 or somewhat truncated posteriorly; more or less regularly dis- 

 posed. When regularly disposed there is an oblong depression 

 between adjacent apertures; when irregularly disposed, this 

 space may be divided into two smaller ones ; or it may appear 

 that the apertures are separated by unequal and irregularly 

 situated depressions. With growth these interspaces are devel- 

 oped into tabulate mesopores. 



21? 210 211 





213 



Fig. 210. Cyclopora fungia. A portion of the surface, x 9. 



Fig. 211. Surface, x 18. 



Fig. 212. An enlargement showing a portion of one of the maculae. 



Fig. 213. A vertical section, x 28. 



Proutella, Ulrich. 

 (Geol. Sur. 111., p. 403. 1890.) 

 Type, Proutella discoidea, Ulrich. 



" Zoarium discoidal, thin, free ; the lower surface convex and 

 with a concentrically wrinkled epitheca. Cells subtubular; 

 76 



