288 THE CRINOIDEA CAMERATA OF NORTH AMERICA. 
Each line of the transverse sets meets one of the longitudinal lines at right 
angles or less, and the apices of these angles fall into lines from the centre 
to the corners of the plates. 
Basals large, forming a flat basin; column facet small and slightly pro- 
jecting; the upper margins distinctly pentangular. Radials large, even for 
the genus. Costals curved like arm plates; the first less than one fourth the 
size of the radials. The first palmar, which bends slightly outward, included 
in the calyx. Structure of arms unknown, but there were apparently two 
arms to the ray. Interbrachials in two ranges, composed at the regular 
sides of one plate each, of which the second is considerably smaller. The 
anal side, which is much wider, is composed of three plates in the first 
row; the median one larger and wedged in between the sloping sides of 
the radials; the second range consists of five smaller plates, irregularly 
arranged, and followed by still smaller pieces. 
Horizon and Locality. — Niagara group; Waldron and Hartsville, Ind. 
Remarks. — This species is allied to JZ. ornatus, but differs in the propor- 
tions of the plates and the absence of radial ridges. The specimen figured 
by Hall in the 20th Rep. of N. Y. State Cabinet on Plate 10, Fig. 7, under 
M. striatus, seems to us to differ essentially from that species in the propor- 
tions of the plates, and may even belong to a different genus. 
Macrostylocrinus fasciatus Hat. 
Plate XXII. Fig. 13. 
1876. Cyathocrinus fasciatus —Hati; Doc. edit. 28th Rep. N. Y. Sta‘e Museum Nat. Hist-, Plate 13, 
Figs. 5 and 6 (without description). 
1879. Macrostylocrinus fasciatus — Hatt; Mus. edit. of same Rep., p. 180: and 11th Ann. Rep. Geol. 
and Nat. Hist. Ohio, 1882, p. 258, Plate 12, Figs. 5 and 6. 
Calyx subovoid; height to width as ten to seven; rounded to two thirds 
the length of the radials, cylindrical above; arm bases but little projecting ; 
ventral disk almost flat. Surface of plates densely covered by fine, waving 
strie, which radiate in fascicles from the basals to a place a little above the 
centre of the radials, whence other bundles pass out to the interbrachials 
and adjoining radials. In addition to the strix, the surface is marked by 
indistinct ridges, which follow the median line of the fascicles, and produce 
a well defined stellate prominence upon the basal cup and upon each radial 
and first interbrachial plate. The ridges upon the costals are the most 
prominent, and increase in width on approaching the arm bases. 
