502 Report of the State Geologist. 



PoLYPORELLA., Simpsoa. 



(Rep. of State Geologist for 1893, p. 700. 1894.) 



Type, Polyporella fistulata^ Hall (sp.). 

 (Plate 1, figs. 9, 10.) 



Zoarium having the same general aspect as Fenestella.. Cell 

 apertures, on the narrower portion of the branches, disposed in 

 two parallel rows, with or without a dividing ridge ; on the wider 

 portions in three and occasionally four rows. 



This genus is intermediate between Fenestella and Poltpora 

 and was constituted to include those forms which might with 

 propriety be included in either genus. 



Poltpora, McCoy. 

 (Carb. Foss. of Ireland, p. 206. 1845.) 



Type, Polypora dendroides^ McCoy. 



(Plate 1, figs. 13-15.) 



Bryozoum having -the same manner of growth and general 

 aspect as Fenestella, but having the cell apertures disposed in 

 three' or more ranges, entirely covering the cellulif erous face of 

 the branches, which are without a median keel or carina. 



Flabelliporella, Simpson. 



(Ann. Rept. State Geologist of K Y. for 1893, p. Y03. 1894.) 



Type, Jblabellijporella lilcBa^ Hall (sp.). 



Zoarium consisting of ramose flabellate or fan-shaped expan- 

 sions. Branches slender, bifurcating, connected by dissepiments. 

 Cellulif erous on one face only ; cell apertures disposed in three or 

 more longitudinal series. 



A fragment of this genus is similar to one of Polyp )r a. The forms 

 are separated from that genus by the flabellate mode of growth. 



Fenestralia, Prout. 

 (Trans. Acad. ScL, St. Louis. 1858.) 



Type, Fenestralia St. Ludovici, Prout. 



^'Corallum flabelliform, bifurcating frequently and rapidly 

 expanding into a broad frond, folded upon itself longitudinally near 

 the top. 



" Longitudinal rays or interstices (branches) large, round 

 near the base, more angular toward the middle of the frond ; 

 midrib indistinct near the base, very prominent and well marked 

 when slightly weathered. 



