Glyptocrinus Redefined and Restricted, etc. 227 
GLYPTOCRINUS sUBNODosUS (Walcott). 
G. subnodosus was also quite recently described by Mr. Walcott in 
advance sheets of the same report. The calyx is ornamented by a 
node at the center of each plate, and by radiating ridges. ‘There are 
five rather large basals; three by five primary radials; and three or four 
—as I infer from the figure and description—by ten secondary radials. 
The rays do not bifurcate after becoming free, which leaves this species 
with only ten arms. The interradial areas are slightly depressed and 
occupied by twelve or fourteen plates to the commencement of the 
vault. There are three intersecondary radials. The column is round 
and proportionally large. 
It is from the Trenton Group, at Trenton Falls, New York. 
GLYPTOCRINUS RICHARDSONI (Wetherby). 
G. richardsoni has a round column; five basals; three by five 
radials; and six or eight by ten secondary radials. The arms divide 
immediately after becoming free, and part of them divide the second 
time so as to make thirty arms. The interradial and intersecon- 
dary radial areas are deeply depressed, and filled with numerous 
plates. ‘The plates are convex or bear acentral tubercle. The azygous 
area is strengthened by a series of large plates, bearing a strong ridge 
in the central part, which gradually fades away in its upward exten- 
sion, and also by a ridge-bearing series, springing from the second 
secondary radials. 
It occurs in the upper part of the Hudson River Group. 
GLYPTOCRINUS FIMBRIATUS (Shumard). ~ 
G. fimbriatus is not very satisfactorily figured or defined, and I am, 
therefore, unable tu make any comparisons with it. 
It occurs in the Trenton Group. 
GLYPTOCRINUS FORNSHELLI (S. A. Miller). 
G. fornshelli agrees with the species referred to Glyptocrinus in the 
number and form of the basals and primary radials, and in having 
secondary radials, but here the resemblance seems to cease. It is 
distinguished by having a pentagonal column, many bifurcations of 
the arms, and peculiar surface ornamentation. There is no ridge 
running up the primary and secondary series, but one commences on 
the third secondary radial, and rapidly swelling, stands out from the 
