2 28 Ulrich on Genera of 'Bryozoa. 
ON SCEPTROPORA, A NEW GENUS OF BRYOZOA, WITH 
REMARKS ON HELOPORA Hall, AND OTHER GENERA 
OF THAT TYPE. 
BY E, O. ULRICH. 
Nearly a year ago Prof. J. F. Whiteaves the palajontologist 
to the Canadian geological survey, kindly sent me for examin- 
ation and description a box of fossil bryozoa which had been 
collected from Lower Silurian rocks in Manitoba. 
Among other interesting forms, I have found the surface of 
some of the slabs strewn with the separated segments of an un- 
described species and genus of jointed bryozoa. 
On my return from Minnesota last October, I stopped over 
for two weeks in Illinois to study the Lower Silurian outcrops 
in the northern part of that state, and at two localities. Savan- 
nah and Wilmington, was so fortunate as to find a number of 
isolated segments of the same form. The Lower Silurian 
rocks at these two localities are doubtlessly equivalent to the 
upper half of the Cincinnati group (Hudson River) of Ohio, 
many of the fossils found in the western localities being iden- 
tical with well known species known to be confined to the 
upper beds of the group in Ohio. 
The equivalence of the rocks at Stony mountain, the locality 
in Manitoba v^^hich furnished the first specimens of the bryozoa 
in question, is as little doubtful as that of the Wilmington or 
Savannah strata, many of the fossils being identical with those 
collected by me at the Illinois localities. 
The genus and species may be described, briefly, as follows: 
ScEPTROPORA n. gen. 
Zoarium articulated; segments numerous, short, sceptre or 
club-shaped, the lower half striated, non celluliferous, its ex- 
tremity bulbous; upper half more or less expanded, celluliferous, 
and with a large socket at the center of the top; occasionally 
with two sockets when the segment had articulated with two 
succeeding joints. Zooecia sub-tubular, radially arranged about 
a central axis, their apertures subovate, and arranged between 
vertical lines. 
Segments club-shaped, varying in length from less than 
