T II E 
AMERICAN GEOLOGIST 
Vol. I. MAY, iSSS. No. 5. 
A NEW GENUS OF CRINOIDS FROM THE NIAGARA 
GROUP. 
BY S. A. MILLER. 
SiPHONOCRiNUS n. gen. 
The species belonging to this genus, so far as known, are 
very large, rough or irregular and robust. They are all casts, 
with the exception of one or two specimens preserving part of 
the plates, with the surface markings destroyed, and the speci- 
men figured by Hall taken from a gutta-percha cast in the 
natural mold, and figured on plate 10 of the 20th Rep. N. Y. 
Mus. Nat. Hist., under the name of Glyptocrimis nobilis^ which 
shows the external ridges and nodes of ornamentation on some 
of the plates. 
Basals three, pentagonal, except as affected by the perfora- 
tion at the end of the column. They are rather small and, 
therefore, may have been nearly covered by the column. 
Primary radials 3x5; the first plates large, heptagonal and 
hexagonal, about as wide as high; the second hexagonal, longer 
than wide, and nearly as large as the first; third radials nearly 
as large as the first, about as wide as high and supporting upon 
the upper sloping sides the secondary radials. 
The first interradials approximate, in size, the first primary 
radials and rest upon the upper sloping sides of the latter. 
They are each succeeded by two smaller plates, and these by 
three or more, and so on diminishing in size and increasing in 
number as they graduate into the plates of the dome. 
The first azygous plate is as large as a first primary, and 
rests upon the basal plates. Three plates follow it, one upon 
its superior edge, and the others upon the upper sloping sides. 
