MELOCRINID^. 271 



Horison and Locality/. — Hudson River group ; Cincinnati^ 0. ; Waynes- 

 ville, 0., and Maysville, Ky. 



Remarks. — It has been supposed by several writers that G. decadadyhis 

 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 Meek. 

 Plate XX. Figs, la, h, c ; and Plate XXL Figs. 8a, h, c, and Fig. 6, 



1872. Meek; Proceed. Acad. Nat. Sci. Pliila., p. 3]4. 



1873. Meek; Geol. Rep. Ohio, Palgeont., Vol. I., p. 32, Plate 2, Pigs. 2a, h (not 26-). 

 1881. W. and Sp.; Revision Palgeocr. ; Part II., p. 188. 



1883. S. A. MiLLEn; Journ. Cincin. Soc. Nat. Hist., p. 222. 



Syn. Oli/ptocrimis Dyeri var. suhglobosus — Meek; 1873, Proceed. Acad. Nat. Sci. Pliila., p. 340; 



also Geol. Rep. Ohio, Palseont., Vol. L, p. 34, Plate 2, Fig. 1c. 

 Syn. Glyptocrinus suhglobosus — W. and Sp. ; 1881, Revision Palaiocr., Part I]., p. 189. 

 Syn. Glyptocrinus Richardsoni — Wetherby ; 1880, Journ. Cincin. Soc. Nat. Hist., Vol. II., p. 245, 



Plate 16, Figs. 1 and la. 

 Syn. Reteoerinus Richardsoni — W. and Sp. ; Revision Palseocr., Part II., p. 193. 



Of the type of Glyptocrinus decadactglus, 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 bifurcation 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. Eadials 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 low^er 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- 



