176 



Bryozomis of the 



tinuons elevations; fenestrules, from .25 to .50 in length, width from 

 .12 to .35 mm.; cell -apertures in two ranges, circular, twenty in 5 mm.; 

 carina .90 mm. in height, for half the height thiu, then expauding, 

 width of summit, .35 mm., connected by oblique lateral bars, thirteen 

 in the space of five mm. 



Locality — Falls of the Ohio river. 



FeXESTELLA (HeMITRYPA) TEGULATA, 71. sp. 



Width of branches .35 mm., acutely rounded or subangular, slightly 

 cariuated, nodose, straight or zig-zag; dissepimeuts, from equal to a 

 little more than the width of the branches, sometimes elevated above 

 and extending across the branches; fenestrules oval, length .55, width 

 .33 mm. ; cell-apertures in two ranges, circular, twenty four in five 

 mm.; height of carina from .50 to .75 mm., expanding to midway to 

 summit, then contracting, summit thin ; the carina connected by lateral 

 bars fifteen in 5 mm. ; arcuate. 



Locality — Falls of the Ohio river. 



Fexestella (Hemitrypa) lata, n. sp. 

 Width of branches from .20 to .50 mm., rounded or angular, rigid, 

 straight or zig-zag ; dissepiments from .50 to .75 mm., sometimes ele- 

 vated above and extending across the branches ; fenestrules, length 

 T5 mm., width .50 mm. Cell-apertures in two ranges circular or 

 oval, sixteen in the space of five mm., carina one mm. in height or 

 half the height, thin, then slightly expanding, connected by lateral 

 bars, twelve in the space of five mm. 

 Locality — Canada West. 



Fexestella (Hemitrtpa) axoxtma, 71. sp. 



Width of branches from .30 to .50 mm., angular, slightly carinated 

 on non-celluliferous face, near bifurcation rounded or gently concave : 

 the carina is replaced by two or three striations as the branch widens ; 

 dissepiments .14 mm. in width. Fenestrules usually oval, length .33, 

 width .22 mm.: cells in tv\o and three ranges, the latter number for 

 only a short distance below the bifurcations : apertures circular, 

 twenty-two in five mm., carina expanding for one-half the height, 

 height .50 mm., width of expanded part .10 mm., connected by lateral 

 bars, twenty in the space of five mm. 



Locality — Falls of the Ohio river. 



Fexestella i^Hemitrypa) peexodosa. n. sp 

 Width of branches .45 mm., v ider opposite the dissepiments; dis- 

 sepiments obscuring the continuity of the branches; branches angular. 



