BRYOZOA. 603 



Position and locality: Upper Coal Measures, Macoupin Co., 

 Illinois, LaSalle and Springfield, Illinois, near Red Oak, Iowa. 

 Nebraska City, Neb., and other localities. 



POLYPORA DISTINCTA UMch. 

 PI. LXI, flg. 7-7a. 



Zoariuni a foliar expansion of unknown dimensions, forming 

 a loose net-work. Branches rather strong, not rigid, moder- 

 ately convex, 0.7 to 1.4 mm. wide, about five in 6.5 mm. Dis- 

 sepiments short, depressed, varying in width from 0.4 to 0.7 

 mm. Fenestrules usually a little narrower than the branches, 

 varying greatly in length, the extremes noticed being 2.7 and 

 4.5 mm., but most of them vary between 3.5 and 4.0 mm., 

 while the average width may be put down at about 0.6 mm. 

 Zooecia in from four to six ranges. These are increased to seven 

 or eight just before bifurcation. Apertures subcircular, often 

 slightly sinuate at the lower margin, arranged in rather regular 

 diagonally intersecting series, in which five occupy a space 

 about 1.4 mm. long; longitudinally thirteen or fourteen OT^cur 

 in 5 mm. Peristome moderately strong, but wanting at the 

 lower side, causing the apertures to appear slightly oblique. 

 Interspaces wide, with an occasional node, and when well pre- 

 served, minutely granulose. Reverse strongly rounded, finely 

 striated or smooth. 



The long fenestrules and general appearance of the zoarium 

 suggests a relationship to P. gracilis and P. maccoyana of the 

 Keokuk group. The incomplete peristome, more crowded zooe- 

 cia, and less convex branches, distinguish it from the first, 

 while the greater length of the fenestrules, less rigid branches 

 and other differences, separate it from the second. P. grandis 

 Toula, and P. gigantea Waagen and Pichl, are larger in every 

 respect. 



Position and locality: Upper Coal Measures; Springfield, 111. 



* 

 POLYPORA CRASSA (Provisional.) 



PI. LXI, flg. 8-80. 



Zoarium a rapidly expanding flat net-work, 4 cms. in width. 

 Branches strong, broadly convex, bifurcating frequently, five to 



