224 Cincinnati Society of Natural History. 
GLYPTOCRINUS PARVUS (Hall), 
G. parvus is quite similar to G. decadactylus, but distinguished by 
being small, and having proportionally a shorter body, and fewer ter- 
tiaries and intertertiaries ; the arm plates are. proportionally longer, 
pinnules stronger, and sculpturing of the calyx less marked. It is so 
much like G@. decadactylus that very few specimens have been dis- 
tinguished. | 
It occurs at the base of the Hudson River Group. 
GLYPTocRINus scuLprus (S. A. Miller). 
G. sculptus is distinguished from G. decadactylus by having 3 by 10 
secondary radials instead of 2 by 10. Other differences relating to 
form and ornamentation have been pointed out. 
It occurs in the upper part of the Hudson River Group. 
GLYPTOCRINUS MIAMIENSIS (S. A. Miller). 
G. miamiensis is much farther removed from G. decadactylus than 
either of the above contrasted species; but it agrees in the general 
character of the column, number and position of the basals and primary 
radials. It is distinguished by being devoid of all sculptured, angular 
and radiated ornamentation, and by the number and irregular divisions 
of the radial series, having as is supposed only sixteen arms. One 
series has three secondary radials, supporting tertiary radials, or giving 
rise to four arms, another has tertiary radials on one side, and not on 
the other, giving rise therefore to three arms, while another has no 
division following the secondary radials, -and therefore gives rise to 
only two arms. The arms are long and pinnule bearing as usual in 
the genus. 
It occurs in the upper part of the Hudson River Group. 
GLYPTOCRINUS RAMULOSUS (Billings). 
G. ramulosus has a bowl-shaped calyx, five basals, 3 by 5 primary 
radials, and 8 or 10 by 10 secondary radials. Billings, in describ- 
ing this species, mentions only four secondary radials, but the speci- 
men figured on Plate VIII., of Decade IV., of the “ Canadian Organic Re- 
’ shows that it possessed as many as eight, and a much injured 
mains,’ 
specimen, in my own collection, shows it possessed at Jeast that many. 
Twenty arms arise from the secondary radials, and as far as observed, 
each one bifurcates in a distance of from twenty to forty plates, so that 
bik = ta 
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