169 



Fi« 



j~. Fiatxlijio- 

 rina segregnta. A por- 

 tion of the surface en- 

 larped, x 12 (after Hall 

 and Simpson). 



Distinguishing Characters. — Thin, lamel- 

 late expansion of fronds; under surface 

 with thin epitlieca ; broadly oval or circu- 

 lar, irregularly disposed, cell apertures; 

 interspaces equal to or greater than diame- 

 tei' of aperture; strong, distinct, smooth 

 peristome; comparatively large mesopores 

 in two or three series l)et\veen apei-tures, 

 theii' margins lower than the peristomes; 

 low. rounded monticules, destitute of cell a])ertures in their 

 center. 



Found in the '' Hamilton group, at p]ighteen Mile (Veek, 

 p]rie Counr}', X. Y.." also '"West Hamburg, Erie County, 

 X. Y."" (Hall.) 



FisTiLii'oiv'ixA MicKOPOKA. (Hall.) (Fig. Go.) (Pal. 

 X. Y., Vol. VI.. p. 220, Pis. LVH., LIX.) 



Distinguishing Characters. — T\\\\\, lamellate expansion of 

 frond, incrusting crinoid stems, etc.; vesiculose intercellular 

 tissue; broadly oval to nearly circular 

 irregularly disposed cell apertures, with 

 thin, smooth peristomes, ranging from con- 

 tact to a cell-diameter apart ; minute meso- 

 pores (about ten in space of 1 mm.) in 

 one, rarely two, series between aj>ertures, 

 their margins equal in elevati(^ntothe peri- 

 stomes; general delicate appearance of 

 surface of frond . 



Found in the " Hamilton group, at Eight- 

 een Mile Creek, Erie County, X^. Y." (Hall); and also in 

 the "Hamilton group, at West Hamburg, Erie County, 

 X. Y." (Explanation of plates.) 



FiSTi'LiPOKiXA MiNUTA. (Romiuger.) (Fig. 64.) (Pal. 

 X. Y., Vol. VL, p. 222, PI. LIX.) 



Distinguishing CImracters. — Thin, lamellate expansion of 

 frond, which is free or incrusting; very thin, concentrically 

 wrinkled epitlieca; irregularly disposed, comparatively large 

 vesicles occupying the intercellular space; oval to obscurely 



Fig. fi3. Fistulipo- 

 rina niicropora. Part 

 of surface enlarged, x 

 ]2(af ter Hall and Simp- 

 son). 



