Ulrich on Genera of 'Bryozoa. 
539 
1 mm. to nearly 2 mm.; lower half sub-cylindrical, about 0.23 
mm. in diameter, non-celluliferous, covered with fine, granulosa, 
vertical strige; lower extremity bulbous, smooth; upper half 
celluliferous, expanding more or less rapidly, the depressed-con- 
ical top varying in diameter from 0.7 to 3 mm. The zooecia 
SCEPTROPORA FACULA n. sp. 
Fig. I. Scepfropora factda,n.sp., a, segment of the average size and ap- 
pearance ; 5, vertical section of a segment, showing tubular zooecia and 
central axis; c, transverse section of the cylindrical lower half of a seg- 
ment; <f, transverse section of expanded portion of the largest segment 
seen. All magnified to 18 diameters. 
apertures on the top are sub-circular, about 0.09 mm. in diam- 
•eter and arranged in radial series between raised lines about the 
large central socket. As the zoarium expands the series in- 
crease in number by interpolation. The zooecia apertures on 
the sides are ovate and a little larger, having an average length 
of 0.1 1 mm. Like those on the top, they are arranged between 
elevated granulose ridges. 
Remarks: The detached segments of this very pretty little 
bryozoan are abundantly strewn over the surface of some of 
the slabs from Ston}' mountain, Manitoba, and I do not doubt 
that if searched for, specimens preserving a number of them 
joined together would be found there. Such must be looked 
for in shaly layers only. Among the Savannah specimens 
there is one consisting of two segments still joined together. 
Those from Wilmington consist of isolated segments. Here 
they are neither abundant nor easily detected, being, because of 
their small size and the peculiar character of the rock, readily 
overlooked. 
