172 
PALEONTOLOGY OF NEW YORK. 
irregular, transverse elevations, nine in the space of 5 mm., which, though 
prominent, do not obscure the branches. Fenestrules oval, length about 
.38 mm., width .25 mm. 
The celluliferous face of this species has not been observed, but the species 
may easily be distinguished from any other at present known by the smaller 
branches, dissepiments and fenestrules, and the much more compact appearance 
of the frond. 
Formation and locality. Upper Helderberg group, Walpole, Ontario, Canada. 
P T I L 0 P 0 It I N A , s. g., Hall. 1885. 
Fenestella (Ptiloporina) conica, n. sp. 
PLATE XLIII, FIGS. 2-4. 
Bryozoum infundibuliform, rapidly expanding, composed of primary and second¬ 
ary branches. The primary branches are very frequent, strongly elevated 
above the others, width .50 mm. ; secondary branches about .30 mm. wide, 
all angular and slightly carinated. On one side of a frond, for some distance 
above the base, all the branches are large and directly connected by dissepi¬ 
ments. Interstices wider than the primary branches. Dissepiments very 
slender, width .20 mm., angular, slightly carinated, much depressed, three or 
four in the space of 5 mm. Fenestrules sub-quadrangular, length 1 to 1.25 
mm., width .35 to .50 mm. Cell apertures in two or three ranges, sixteen in 
the space of 5 mm. 
This species can be distinguished from the others of this sub-genus, by the 
numerous primary branches, slender dissepiments and large fenestrules. 
Formation a?id locality. Upper Helderberg group, Schoharie, N. Y. 
Fenestella (Ptiloporina) pinnata, n. sp. 
PLATE XLIII, FIGS. 5, 6. 
Bryozoum infundibuliform, composed of primary and secondary branches. Pri¬ 
mary branches distant, width .50 inm., width of secondary branches .35 or.40 
mm., all angular and slightly carinated. Interstices wider than the branches. 
