306 THE CRINOIDEA CAMERATA OF NORTH AMERICA. 
other parts of the calyx unknown. Column slightly pentagonal, each alter- 
nate joint provided with a node or short spine at the margin. 
Horizon and Locality. — Oriskany Sandstone, Cumberland, Md. 
Type in the American Museum of Natural History, New York. 
Technocrinus Andrewsi Hatt. 
Plate XXIV. Fig. 3. 
1859. Hatz; Paleont. New York, Vol. III., p. 141, Plate 86, Figs. 1-4. 
1881. W. and Sp.; Revision Paleoer., Part IL, p. 117. 
A rather large species. Calyx to the arm bases hemispherical ; plates 
moderately convex, surrounded by sets of short marginal ridges passing in- 
ward, three to four to each side of the plate, and by small pits along the 
sutures; the centre of the plates perfectly smooth. Basals wider than high. 
Radials large, about as long as wide. First costals of the form of the radi- 
als, but considerably smaller ; the second still smaller, narrower as well as 
shorter. Distichals one, axillary; supporting in the calyx two rather large 
palmars, followed by several cuneate, interlocking free plates, and these by 
two rows of subquadrangular pieces, united by a sharply zigzag suture. 
Arms four to the ray, strong, flat, and of almost uniform width throughout. 
Pinnules contiguous. Interbrachials four or five: 1, 2,1, 1, all compara- 
tively large. Column round, large, tapering; the joints rather long and 
slightly rounded exteriorly. 
Horizon and Locality. — Oriskany Sandstone, Cumberland, Md. 
Type in the American Museum of Natural History, New York. The 
species is described and figured from a cast made from the natural mould in 
the rock. 
ALLOCRINUS W. and Sp. 
1889. W. and Sp.; Geol. Rep. Ilinois, Vol. VIIT., p. 206. 
Calyx small; the arms stout; symmetry of dorsal cup equilateral. 
Basals three, small, unequal — the left antero-lateral plate one half the 
smaller — forming a disk, which is almost completely covered by the col- 
umn. Radials large, much wider than the costals. Costals two, rounded 
like arm plates. Arms uniserial, strong, simple; two to the ray, being 
free from the second or third distichal. Interradial spaces composed of 
two or three plates, of which the first is much the largest. Column 
small, round; axial canal narrow, pentangular. 
