CORALS AND BRYOZOA. 171 



PTILOPORELLA, s. G., Hall. 1885. 

 Fenestella (Ptiloporella) laticrescens, n. sp. 



NOT FIGDRED. 



Bryozoum infundibuliforra, composed of primary and secondary branches. The 

 celluliferous face of this species only has been observed. Branches straight or 

 very slightly sinuous, width of primary branches about .50 mm., of second- 

 ary ones .33 mm., some of the secondary branches greatly increase in size, the 

 others continue for their entire length without enlarging. Interstices of the 

 same width as the smaller branches. Dissepiments comparatively strong, 

 width .35 mm., gently rounded, very much depressed, three in the space of 

 4 mm. Fenestrules regularly oval, length slightly less than 1 mm., width 

 .33 mm. Cell apertures in two ranges, minute, opening directly outward, 

 separated by one and one-half times the diameter of an aperture. Surface 

 between ranges of apertures carinated, on the primary branches carinae strong, 

 height .50 mm., expanded at the summit to a width of .45 mm., and slightly 

 carinated ; carinae on the secondary branches comparatively thin, height .35 

 mm., summit not expanded. 



This species may be distinguished from F. (Ptiloporina) sinistralis by its having 

 only two ranges of cell apertures, from F. {Ptiloporina) disparilis by the larger 

 size of the branches, dissepiments and fenestrules. 



Formation and locality. Upper Helderberg group, Walpole, Ontario, Canada. 



Fenestella (Ptiloporella) inequalis, n. sp. 



IfOT FIQCKBD. 



Bryozoum infundibuliform, composed of primary and secondary branches, pri- 

 mary branches .45 mm. wide, the secondary ones .20 mm., straight, rounded, 

 the primary branches elevated about .25 mm. above the others. Interstices 

 very slightly wider than the secondary branches Dissepiments compara- 

 tively strong, width .18 mm., rounded, sometimes slightly carinated, nearly 

 on a plane with the branches, sometimes elevated above and continuing across 

 the branch, coalescing with adjacent dissepiments and forming continuous, 



