MELOCRINIDZ&. 287 
Dorsal cup about as high as wide; cross-section subpentangular ;_ the 
median portions of the basals and costals slightly elevated ; their surfaces, 
and those of the radials, covered with fine, interrupted strix, and the inter- 
brachials with elongate tubercles, which at the centre of the plates become 
obsolete. The suture lines well defined. 
Basals not as large as in some of the other species, forming a shallow 
basin with obtuse upper angles. Radials more than twice as large as the 
costals, slightly spreading; the upper faces somewhat shorter than the 
lower First costals hexagonal, their upper sloping faces much shorter than 
the sloping lower ones; the second costals smaller than the first, the upper 
side obtusely angular. Distichals free above the first; the three proximal 
plates quadrangular, the edges of their upper and lower faces crenulated ; 
the succeeding three or four plates cuneate, and the plates above interlocking 
so as to form two rows of arm plates; the latter covered by two rounded 
tubercles, transversely arranged, and placed in rows longitudinally. Arms 
ten, long and rounded. Regular interbrachials three known; the lower 
plate twice as large as the two upper; the latter resting against the sides of 
the second costals, slightly touching the first. All other parts of the species 
unknown. 
Horizon and Locality. — Shales of the Niagara group; Lockport, N. Y. 
Remarks. — We have been unable to trace the type specimen, and our 
description was made from Hall's figure in the New York Report. 
Macrostylocrinus striatus Hatt. 
Plate XXII. Figs. 14a, b, ec. 
1863. Hatt; Trans. Alb. Inst., Vol. IV., p. 207 (abstr. p. 13). 
1866. Snumarp; Trans. Acad. Sci. St. Louis, Vol. IL. p. 861 (Ctenocrinus striatus). 
1879. Han; 28th Rep. N. Y. State Mus. Nat. Hist. (Museum edit.), p. 129, Plate 13, Figs. 1-4. 
1881. W. and Spe.; Revision Paleoer., Part II., p. 103. 
1882. Hatt; 11th Ann. Rep. Geol. and Nat. Hist., Ohio, p. 257, Plate 12, Figs. 1-4. 
Calyx to the bases of the arms pyramidal; the sides slightly convex; the 
fixed brachials formed into broad rounded ridges, which pass up to the arms; 
interradial spaces somewhat concave, except at the anal side where the 
median portion is slightly bulging and angular. Surface of plates covered 
by fine undulating striz or series of granules, about twelve of which traverse 
the lower half of the radials to the basals; another set passes up to the 
costals, and a third and fourth transversely to the sides of adjoining radials, 
