LOWER HELDERBERG ROCKS. 
COLUMNS AND PLATES OF UNDETERMINED CRINOIDEAE. 
Plate LXXXY, Fig. 19 - 28. 
Fragments of large columns, with thick nodiferous joints separated by three 
smaller joints, the middle one of which is broader and thicker than the one on each 
side, are common in the sandstone : they probably belong to a species of the Sub¬ 
genus Technocrinus. 
The illustrations are of fragments which are marked by a deep concavity on the 
extremities, and a small round canal, as seen in fig. 20; but not unfrequently pre¬ 
senting the appearance of a very-large canal, from the removal of the thin central 
portion of the plate, as in the remaining figures 19, 22 and 23. 
A single plate ( fig. 5 of Plate lxxxvi) belongs to a species of crinoid distinct from 
any here described : it is probably of the Subgenus Technocrinus , with the radiating 
lines much finer than either of the others. 
Geological position and locality. In the Oriskany sandstone, Cumberland, Md. 
CY.STIDEJE OF THE ORISKANY SANDSTONE. 
Aiiomalocystites disparilis (n. s.). 
Plate LXXXYIII. Fig. 1-4. 
Body longitudinally subelliptical in outline (when viewed from the an¬ 
terior or posterior direction), concavo-convex, with the margins strongly 
angular. Basal plates, or plates of the first series, on the concave side, 
two, somewhat triangular and strongly curvilinear, together giving a 
deep crescent-form outline to the base ; on the convex side, three plates. 
Second range on the concave side, a single large plate which is slightly 
curved on the lower side; the lower angles truncate and the sides ver¬ 
tical, one longer than the other, and unequally indented above for the 
reception of two plates, and on the upper lefthand angle for the recep¬ 
tion of an irregular plate. Third range consisting of three plates. Fourth 
range unknown. Convex or posteal side above the basal plates composed 
somewhat irregularly of six ranges of plates, having 3+4(5?)+5+4+4 
plates respectively; above which the structure is unknown. Lateral or 
radial plates three known on each side in direct succession, the lower 
[ Palaeontology III.] 19 
