272 THE CRINOIDEA CAMERATA OF NORTH AMERICA. 
ais 
ently of all arm plates, are covered with well marked radiating strie and 
grooves. The arms in their free state branch but once; they are rather thin, 
especially at the upper ends, and composed of short, somewhat cuneate 
pieces. Interradial spaces slightly impressed between the costals, and dis- 
tinctly grooved between the distichals. First interbrachials about as large 
as the radials; the plates of the second row a little smaller, supporting 
a fourth plate between their upper sloping faces, and two plates in the next 
two rows, followed by numerous small pieces, which enclose the fixed pin- 
nules. The anal area is a little wider, having three plates in the second and 
all succeeding rows up to the first pinnule; the middle series being marked 
by a rather conspicuous ridge. Interdistichal spaces elongate, their median 
portions deeply grooved; the first plate large, followed by two plates in the 
second row, and a number of small pieces above. Construction of the ventral 
disk, and position of the anus unknown. Column round, — not indistinetly 
pentangular as stated by Meek; the nodal joints somewhat larger; the axial 
canal pentalobate, and moderately large. 
Horizon and Locality. — Hudson River group ; at Cincinnati, Lebanon and 
Waynesville, Ohio, and also found at Richmond, Ind. 
Type in the Museum of Comparative Zodlogy, Cambridge. 
Remarks. — This species is readily distinguished from G. decadactylus, its 
nearest ally, by the uninterrupted series of anal plates. It is quite remark- 
able for its large number of incorporated pinnules, of which the proximal 
ones have almost the proportions of armlets. Meek’s G. Dyeri, var. globosus, 
which we thought to be a good species, judging from the figures, can hardly 
rank even as a variety. We have examined the type in the Museum of 
Comparative Zoilogy, and find it to have all the characteristics of G. Dyert. 
Wetherby’s G. Richardsoni also, which we once regarded as a Reteocrinus, is 
based upon a somewhat aberrant specimen of this species. 
(?) Glyptocrinus Shafferi Miter. 
Plate XXTI. Figs. 3d, e, f. 
1875. Glyptocrinus Shafferi—S. A. Mrier; Cincin. Quarterly Journ. Sci., Vol. II., p. 277; and 1880, 
Journ. Cinein. Soc. Nat. Hist., Vol. IIT., p. 233, Plate 7, Figs. 2a, 4, and 3a, 4, c. 
1881. Glyptocrinus Shafferi— W. and Sr.; Revision Paleocr., Part II., p. 189. 
1883. Pycnocrinus Shafferi —S. A. MitreR; Journ. Cinein. Soe. Nat. Hist., Vol. VI., p. 231, and North 
Amer. Geol. and Paleont., p. 276. 
There is but little doubt that the small specimens which S. A. Miller 
described as Glyptocrinus Shafferi, and G. Shafferi, var. germanus, and for 
