1G3 



on a plane with the branches, and slightly expanding at 

 their junction, with a slight carina .similar to and uniting 

 with that of the branches; elongate to broadly oval fenes- 

 trnles; cellnliferons face; rounded character of branches 





t JLKJLA A 



3 rm i.-ia -z3 •-■'9' 



' , tz - - *^ - — ' r 



-*- 'j —^ ' ~ *f - 1 



W W" :T '-TV 



•K7p : ,'j - -fit., 5 " ? 



Fig 51A. Polypora multiplex. Portion of a frond natural size: enlargement of the non- 

 celluliferous face, showing angular branches connected by slender dissepiments, xti; en- 

 largement of celluliferous face, showing form and disposition of cell apertures, and the 

 stria? or ridges between the ranges of apertures, x t> ; transverse sections of different 

 fronds, showing variation, x 6 (from Hallj. 



and dissepiments, the latter slender and much depressed, 

 obscure, and sometimes obsolete ; narrow fenestrules, adja- 

 cent branches frequently almost or quite in contact; cell aper- 

 tures in two to four ranges, circular or oval, closely arranged; 

 smooth interspaces; strong elevated peristomes. 



Found in the Hamilton group at Alden, Erie Co. (Hall), 

 and at Eighteen Mile Creek. (Coll. Am. Mas. Nat. Hist., New- 

 York.) 



