ROGERS: NEW BRYOZOANS. 7 



0.5 ram. Zoecia in from three to five alternating ranges, these being 

 the extremes between the bifurcations. The i^revailing number is 

 four. Apertures small, pyriform, a little more than their diameter 

 apart, about eighteen in 5 mm. Each aj^erture is situated at the bot- 

 tom of a depressed area, wliich is formed by longitudinal ridges be- 

 tween the ranges and horizontal ridges connecting these. A sloping 

 area extends from the anterior end of the depression to the cell aper- 

 ture which is situated at the posterior end. On the longitudinal 

 ridges spines are regularly arranged, about as numerous as the aper- 

 tures. Reverse not seen. 



Position and locality: Upper Coal Measures; Topeka, Kan. Type 

 in University of Kansas Museum. 



The roughened surface of the obverse face serves to distinguish 



this species from other representatives of the genus in the Coal 



Measures. 



Polijitora /ir./KOKff, n. sp. Plate II, fig. i. 



Zoarium a slowly expanding foliar network, of unknown size. 

 Branches slender, quite flexuous, convex, O.fS mm. wide, ten occurring 

 in a space of 5 mm. Dissepiments very short, nearly as wide as the 

 branches, but slightly depressed. Fenestrules narrow elliptical in 

 outline, averaging 0.7 mm. l)y 0.25 mm., five in 5 mm. Zoecia in 

 three alternating ranges, which number is reduced to two for a short 

 distance after bifurcating. Zoecial apertures small, subcircular, with 

 thin peristomes, about twice their diameter apart longitudinally, 

 twenty in 5 mm. Space between the cell ranges occupied by single 

 rows of small nodes about as far apart as the apertures. Reverse 

 not seen. 



Position and locality: Ui^per Coal Measures; Argentine, Kan. 

 Type in author's collection. 



Differs from other species of the genus in the flexuous character of 

 the branches. No other Coal Measures species has so few zoecia 

 apertures except P. whitei Ulrich, from which our species is easily 

 distinguished. Those portions of a branch having two ranges of 

 apertures sometimes laossess a faint carina, which gives it the appear- 

 ance of a Fenestella. Here we have another of the numerous links 

 between Fenestella and Polypora, only one of which has heretofore 

 been described from the Coal Measures, namely, P. lahitei Ulrich, 

 from Seville, 111. 



Polf/pora eUij>th-a, n. sp. Plate IV, fig. 2. 



Zoarium a reticulate expansion. Branches slightly flexuous, con- 

 vex, 0.4 to 0.5 mm. wide, seven to eight in 5 mm. Dissepiments 

 short, subcarinate, about half as wide as the branches. Fenestrules 

 ellii^tical (especially in worn specimens), averaging about 0.6 by 0.3 



