6 KANSAS UNIVERSITY QUARTERLY. 



Position and locality : Upper Coal Measures ; Argentine and Law- 

 rence, Kan. Type in author's collection. 



Resembles F. hurlingtonensU Ulrich, but differs mainly in having 

 more prominent nodes and a greater number of apertures in a given 

 space. F. hurling ton ensis has seventeen in 1 cm., while our si)ecies 

 has twice that number. 



FenestelJd or(fiij)ora. n. sp. Plate II, fig. 1. 



Zoarium a rapidly expanding reticulate expansion; size unknown. 

 Branches lax, slender, rather convex, subcarinate, somewhat flexuous, 

 0.3 to 0.4 mm, wide, seven occurring in 5 mm. ; bifurcating at various in- 

 tervals, the average being about 3 mm. Median keel obsolete or rep- 

 resented by a raised space between the apertures. Dissepiments 

 rather short, very narrow, and depressed. Fenestrules subelliptical 

 to subquadrangular, quite variable in size, average dimensions being 

 about 1.1 mm. long by 0.4 mm. wide, slightly indented by the en- 

 croaching zoecia mouths. Four fenestrules occur in a space of 5 mm. 

 Zoecia in two alternating rows. Zoecial apertures small, ovate, with 

 rather prominent peristomes, about twice their diameter apart, four 

 to each fenestrule, seventeen in 5 mm. 



Position and locality: Upper Coal Measures; Kansas City, Mo. 

 Type in author's collection. 



All other Coal Measure species of the genus have circular aper- 

 tures. 



FencsfeUd nifssoiwieHsis. n. sp. Plate II. fig. 2. 



Zoarium a rather rapidly expanding foliar network. Branches 

 rather strong, slightly flexuous, 0.3 mm. wide, ten in a space of 5 mm. 

 Dissepiments short, narrow, rounded, much depressed. Fenestrules 

 subquadrangular to elliptical, 0.6 mm. by 0.3 mm., slightly indented 

 by the zoecia mouths, six and one-half occurring in 5 mm. Carina 

 narrow, rather prominent, slightly flexuous, surface rough Imt without 

 distinct nodes. Zoecia in two alternating rows, nineteen in 5 mm. 

 Apertures rather large, circular, with slight peristomes, a little more 

 than their diameter apart, three to a fenestrule. Surface covered 

 with obscure longitudinal striae. Reverse not seen. 



Position and locality : Upper Coal Measures ; Kansas City, Mo. 

 Type in author's collection. 



Pofi/j)or(f asjtcrd . n. sp. Plate II, figs. .3, .3r/. 

 Zoarium a foliate expansion of unknown size. Branches rather 

 strong, quite convex, about 0.5 to 0.6 mm. wide, sometimes less just 

 after a bifurcation, six in a space of 5 mm. Surface very much rough- 

 ened by elevations and depressions. Dissepiments short, rounded, 

 depressed, about one-half as wide as the branches. Fenestrules nar- 

 row ellijjtical or subquadrangular, two in 5 mm., averaging 2 mm. by 



