MELOCRINID_E. 271 
Horizon and Locality. Hudson River group; Cincinnati, O.; Waynes- 
ville, O., and Maysville, Ky. 
Remarks.—It has been supposed by several writers that G. decadactylus 
had rudimentary infrabasals, but this is not the case. In a fine specimen 
from which every vestige of the stem was removed, we could follow the 
interbasal sutures to the axial canal, and found the latter to be interradial 
and not radial, the part which had been supposed to represent the infra- 
basals being the upper stem joint. 
Glyptocrinus Dyeri Merk. 
Plate XX. Figs. 1a, b, e; and Plate X XI. Figs. 3a, b, c,and Fig. 6. 
1872. Meek; Proceed. Acad. Nat. Sci. Phila, p. 314. 
1873. Meek; Geol. Rep. Ohio, Paleont., Vol. I, p. 32, Plate 2, Figs. 2a, 4 (not 2c). 
1881. W. and Sp.; Revision Paleocr.; Part II., p. 188. 
1883. S. A. Mitrer; Journ. Cincin. Soc. Nat. Hist., p. 222. 
Syn. Glyptocrinus Dyert vav. subglobosus — MrrxK; 1872, Proceed. Acad. Nat. Sci. Phila., p. 340; 
also Geol. Rep. Ohio, Paleont., Vol. I., p. 34, Plate 2, Fig. 2c. 
Syn. Glyptocrinus subglobosus — W. and Sp.; 1881, Revision Palwoer., Part II., p. 189. 
Syn. Glyptocrinus Richardsoni —WetuERBy ; 1880, Journ. Cincin. Soe. Nat. Hist., Vol. II., p. 245, 
Plate 16, Figs. 1 and la. 
Syn. Reteocrinus Richardsoni — W. and Sp.; Revision Paleoer., Part II., p. 193. 
Of the type of Glyptocrinus decaductylus, but the calyx globose instead of 
obconical. It has a similar ornamentation, but the ridges are less angular, 
being rounded, and those following the radial and anal plates are more 
prominent; the arms are thinner, and the second bifureation takes place in 
the arms. 
Basals small, much wider than long, with a sharp, almost circular rim 
around the bottom, which extends slightly beyond the column. Radials and 
costals a little wider than long, the latter somewhat the smallest. Distichals 
nine to sixteen or more, their number varying among the rays, the five to 
eight lower ones forming part of the calyx, the others being arm plates. 
The two lower distichals nearly as large as the upper costals. The succeed- 
ing plates decrease rapidly in size upwards. Their second plate has the 
form of an axillary, giving off to the outer side of the ray a large pinnule ; 
the third is quadrangular and bears no pinnule; the fourth plate bears the 
second pinnule at the inner side of the ray, above which every plate is 
pinnule-bearing. In large specimens, as much as six pinnules are incorpo- 
rated into the calyx, and these are not only larger than the succeeding ones, 
but are placed farther apart. The apposed faces of the distichals, and appar- 
