CORALS AND BRYOZOA. 
171 
PTILOPORELLA, s. g., Hall. 1885. 
Fenestella (Ptiloporella) laticrescens, n. sp. 
NOT FIGURED. 
Bryozoum infundibuliform, 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 inm., 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 carinse strong, 
height .50 mm., expanded at the summit to a width of .45 mm., and slightly 
carinated; carinse 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. 
NOT FIGURED. 
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 nun., 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, 
