296 THE CRINOIDEA CAMERATA OF NORTH AMERICA. 
upward. Anal interradius considerably wider, and flattened instead of being 
grooved as in the case of the other four; the first plate is the largest, and is 
followed by three pieces in the second row, and these by three or four pieces 
in the succeeding rows. Interdistichals four, rather large and longitudinally 
arranged ; the upper one resting between the two proximal palmars. Nothing 
is known of the ventral disk, nor of the anus. Column large, round, com- 
posed near the calyx of moderately long joints alternating with shorter ones ; 
suture lines distinctly waving. 
Florizon and Locality.— Pentamerus limestone; Litchfield, Herkimer 
Co., N. Y., and apparently also found in the Niagara group of Western 
Tennessee. 
Types in the American Museum of Natural History, New York. 
Melocrinus pachydactylus (Conran). 
Plate XXIII. Figs. 4 and 5, and Plate XXIV. Figs. 4a, b. 
1841. Astrocrinites pachydactylus —Conrad; Ann. Rep. Paleont. N. Y., p. 34. Also Mather 18438; 
Geol. Rep. N. Y., p. 246. 
1859. Muariacrinus pachydactylus — Hai; Paleont. N.Y. Vol. III., p. 107, Plate 3, Figs. 1-4. 
1881. Melocrinus pachydactylus — W. and Sp.; Revision Paleoer., Part II., p. 122. 
Syn. Actinocrinus polydactylus Bonny (not 8. A. Miller) ; Schenectady Reflector of 1835. 
Syn. Mariacrinus paucidactylus Hatt; Paleont. N. Y., Vol. III., p. 109, Plate 3, Fig. 5. 
Syn. Melocrinus paucidactylus —W. and Se.; Revision Paleocr., Part 11, p. 122. 
Smaller than the preceding species; dorsal cup shorter and with convex 
sides; interradial spaces not grooved, although slightly impressed in the 
upper portions; the radiating ridges upon the surface much more conspicu- 
ous, and ending m a node at the centre of the plates; the arms given off at 
greater intervals, and the pinnules less closely packed together than in that 
species. 
Basals formed into a short spreading cup, of which the lower margin 
is slightly projecting. Radials and costals of nearly equal size, as wide 
as long; both covered by a broad, flattened ridge, which bifurcates on the 
second costal and follows the distichals. Narrower ridges pass out to the 
interbrachials. Distichals 5X 10, smaller than the costals. The avillaries 
support upon the inner sides of the ray from seven to eight palmars, which 
are laterally connected; at their outer sides the proximal arms, of which 
the five lower plates are considerably the longest, and form part of the calyx. 
The two lower palmars of each side are longer than the upper ones, and 
those of the one division are separated from those of the opposite side by a 
