ROGERS : NEW BRYOZOAXS. 5 



obscure nodes. The fenestrules are more or less hexagonal in out- 

 line. 



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

 in University of Kansas Museum. 



The reverse side resembles that of Fenestella flexnosa Ulrich, but 

 the obverse side of that species is quite different from that of ours. 

 The cell apertures of F. flexuosa are more numerous and closer 

 together. Differs from ail other species of the genus in the hexagonal 

 appearance of the fenestrules on the reverse side. 



Fenestella dentata, n. sp. Plate I, figs. 5, 5a. 



Zoarium a reticulate expansion ; size unknown. Branches straight, 

 rather slender, 0.4 mm. wide, eight in a space of 5 mm. Dissepimenis 

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

 long and narrow, subquadrangular to subellii^itical in outline, averag- 

 ing 0.9 mm. by 0.3 mm., four in 5 mm.; but slightly indented by the 

 encroaching zoecia mouths. Carina rounded, rather strong, bearing 

 a row of prominent flattened, conical nodes, a little more than their 

 diameter apart, twelve in 5 mm. Zoecia in two alternating ranges, 

 about eighteen in 5 mm. Apertures circular, slightly more than their 

 diameter apart, generally arranged so that there are four to each 

 fenestrule. Reverse not seen. 



Position and localit}^ : Upper Coal Measures ; Topeka, Kan. Type 

 in University of Kansas Museum. 



Resembles F. cestriensis Ulrich from the Chester group, Illinois, 

 somewhat, but differs mainlj^ in having the carina and the nodes more 

 prominent. This species is distinguished from other Coal Measures 

 species by the narrow, elongate form of the fenestrules. 



Fenestella kansasensis. n. sp. Plate I, fig. 6. 



Zoarium a rapidly expanding foliar network, of unknown size. 

 Branches rather strong, slightly fiexuous, about 0.4 mm. wide, bifur- 

 cating at intervals of 3 to 5 mms. ; number of branches in 5 mm., eight. 

 Median keel strong, moderately elevated, rounded, somewhat flexuous, 

 bearing a single row of small nodes, 0.5 to 0.6 mm. apart, placed so that 

 two usually occur for each fenestrule. Dissepiments short, depressed, 

 about one-half as wide as the branches. Fenestrules subelliptical to 

 subquadrangular, slightly indented by the encroaching zoecia mouths, 

 averaging 0.8 mm. bj' 0.4 mm., with about nine in 1 cm. Zoecia in 

 two alternating ranges, eighteen in 5 mm., usually four to each fe- 

 nestrule. Apertures small, circular, separated by interspaces about 

 the same width as their diameter. Reverse not seen. 



A worn specimen, evidently of this species, has wider fenestrules, 

 but in most respects agrees with the type. 



