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(Crinoidea)
Genus Icthyocrinus, Conrad, Jour. Acad. Nat. Sc. vol 8 p. 279 (18 ) Hall Pal. of NY vol 2 p. 195 4p 319
Column round, smooth & slender having the articulating rays on the outer circumference; canal small & round; scapulae with the margins of the articulations parallel, & somewhat imbricated; the base of the cup shows five small triangular pelvic plates; a second & third scapular plate succeed in direct series when subdivision takes place, which is repeated two or three times at irregular intervals; base of the cup when the column is separated, presents a tripetalous impression.
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[Pleurothmaria rotuloides, Hall, Pal. of N.Y. vol 1 p 173 pl 37 fig 7.]
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Icthyocrinus? Clintonensis, Hall, Pal. of N.Y. vol. 2 p. 181 pl A 41 fig 5
The specimen consists of the arms & fingers, which are not tentaculated; the arms divided at irregular [intervals] distances from the base, and are each composed of a single quadrangular series of plates, except the joint at the bifurcation, which is pentagonal.
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Middle Silurian-Clinton Group.
Reynales Baron, Niagara Co. N.Y.
[Crossed out, upside down text-Pleurotomaria subconica, Hall, Pal. of N.Y. vol. 1 p. 174 pl. 87 fig. 8]
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Icthyocrinus laevis, Conrad, Jour. Ac. Nat. Sc. vol. 8 p. 279 pl. 15 fig. 16 Hall, Pal. of N.Y. vol. 2 p. 195 pl. 43 fig. 2.
Columns slender, round and smooth gradually enlarging towards the base of the cup, and composed of alternating thicker and thinner jointsl; base of the cup showing a tripelatous impression (or three undeveloped pelvic plates surrounding the centre); pelvic plates five, triangular, with wide bases; on one side an interval between the pelvic plates, allowing one of the second series to rest upon the column [(See figs 2l, g)] for a narrow[ing] space; second series having the form and position of scapular plates; lower side resting on the sloping sides of the pelvic plates; upper edge nearly parallel to the lower, giving the succeeding plates the same form on the lower side, each
