168 



A single fragmenl of ;i free frond was found in the Demissa 

 bed of Sec1 ion 5, a1 Eighteen Mile Creek. 



Genus FISTULIPORINA. Simpson. 



[ Ety. : Fistula, pipe ; p&ros, pore.] 

 (1894: 14ili Rep'l X Y. State Geol., p. 555, PI. XXI.) 



Bryozoum consistingof Free or incrusting flat and spreading 

 fronds, or of masses made up of successive layers. The cells 

 are tubular and open by circular or oval apertures, which 

 are furnished with granular or spinulose rims or peristomes, 

 and are irregularly disposed. The space between the cells is 

 eupied below by irregular vesicles and near the top by 

 irregularly superimposed • vesicles, or by mesopores with 

 tabulae. Space between apertures occupied by angular pits, 

 and often, also, by nodes or spines. Base covered by strong 

 epitheca. The genus differs from Fistulipora in its circular 

 cell apertures, 'and in the absence of pseudosepta and 

 lunaria." 



Dlrich's genus Cyclotrypa, published in Zittel's Pal.eon- 

 tology (Eastman's translation), p. 2(59, is a synonym. 

 Simpson's name having priority according to the date on 

 the title page. 



FlSTULlPOBINA SCROBICULATA. (Hall.) (Fig. 61.) (Pal. 

 X. V.. Vol. VI.. p. 212, Pi. LVIII.) 



Distinguishing Characters. — Cell apertures 

 distant from each other something more than 

 their diameter; strong granulose peristomes; 

 large mesospores, frequently equal to cell- 

 apertures, with slightly elevated margins; 

 huge sterile ( poreless I blotches or maculae, 

 1 to 2 mm. in diameter, occur at intervals: 



FlO. 61. Fistulipo- 



rtno scrobicuiata. adjacent apertures not larger than others. 



A portion '>f ill'- sur- i tr o 



• ,"M^'a!;;i ^imii" Found in the "Hamilton group. Eighteen 

 MileCreek, ErieCounty, X. V." ( Ball.) 



FlSTULIPORINA SEGREGATA. (Hall.) (Fig. 62.) (Pal. 



\. V.. Vol. VII.. p. 219, PI. LIX.) 



x/t 



