226 Cincinnati Society of Natural History. 
GLYPTOCRINUS BAERI (Meek). 
G. baert has five short pentagonal basals, three by five primary 
radials, and four by ten secondary radials. The radials are large, 
separated externally at the sutures, and stand out prominently from 
the calyx. The interradial areas are deeply depressed, and each has 
twenty or more plates, each bearing a radiately sculptured tubercle, 
but without the connecting ridges, as in G. decadactylus. The inter- 
secondary radial spaces bear six or more similar plates. The azygous 
area has a central longitudinal series of larger plates bearing a ridge 
which gradually tapers above as in other species. The column is 
round. There are only ten arms, these are very broad, strong, and 
composed of alternately arranged, thin, projecting cuneiform plates 
bearing long pinnules. The vau!t is similar to that of G. decadactylus. 
This is a strongly marked species, but unless generic characters are 
founded upon thenumber and structure of the arms, there is nothing to 
take it out of the genus Glyptocrinus. 
It occurs in the upper part of the Hudson River Group. 
GLYPTOCRINUS PATTERSONI (S. A. Miller). 
G. pattersoni is a small species, with concave interradial areas and 
angular outlines, Baszals, five, very small. Primary radials, three by 
five. Secondary radials, three or four by ten, from the last ones of 
which the arms become free, and do not afterward bifureate. This 
limits the number of arms to ten. Surface of the body, sculptured. 
Column, round. Arms and pinnules, in proportion to the size of the. 
calyx, long and coarse. 
It occurs in rocks of the age of the Utica Slate Group. 
GLYPTOCRINUS ARGUTUS (Walcott). 
G. argutus was described quite recently by Mr. Walcott in 
advance sheets of the 35th Rep. N. Y. St. Mus. Nat. Hist. It has five 
low basals; three by five primary radials, the first one being much the 
larger. Secondary radials, two by ten, as I infer from the figure 
and description. Arms, bifurcating at the fifteenth plate from the 
primary radials. Interradial areas slightly sunken, and having six 
plates to the inturning of the vault. One plate in each intersecondary 
radial area. Surface of calyx, nearly smooth. Column, round and 
projecting plates having a denticulated border. From the Trenton 
Group, at Trenton Falls, New York. 
