. Bulletin of the Buffalo Society of Natural Sciences. Natural history; Science. 156 NEW YORK STATE MUSEUM terradial plates. Lower brachials forming a part of the calyx; hexagonal, pentagonal, axillary bearing the distichals. In- terradials lying chiefly between the costals. Arms 10 to 20, biserial. Stem round. Thysanocrinus liliiformis Hall (Fig. 50) (1852. Pal. N. Y. 2:188,. pi. 42) Distinguishing characters. Surface of plates ornamented by verti- cal or radiating, interrupted or crenulated, sharp, elevated striae; small infrabasals, large basals and still larger radials; three
. Bulletin of the Buffalo Society of Natural Sciences. Natural history; Science. 156 NEW YORK STATE MUSEUM terradial plates. Lower brachials forming a part of the calyx; hexagonal, pentagonal, axillary bearing the distichals. In- terradials lying chiefly between the costals. Arms 10 to 20, biserial. Stem round. Thysanocrinus liliiformis Hall (Fig. 50) (1852. Pal. N. Y. 2:188,. pi. 42) Distinguishing characters. Surface of plates ornamented by verti- cal or radiating, interrupted or crenulated, sharp, elevated striae; small infrabasals, large basals and still larger radials; three distichals. in each of the 10 arms, the lowest large and hexagonal, the others cuneiform, followed by the biserial upper arm plates; stem joints- round and alternatingly thin and ihick, most irregular near the base of the calyx. Found so far only in the Rochester shale at Lockport (Hall), but may also_ occur at Niagara. Genus lyriocrinus Hall [Ety : Xopiov, small lyre; -/.pvMr;,Y\\y\ (1852. Pal. N. Y. 2 :i97) Calyx depressed, with a dicy- clic base. Infrabasals five; ba- sals five, pentagonal, truncated, at the upper end. Radials sepa- rated all around by large inter- radials, which scarcely differ from the anal interradius. Anal, aperture eccentric. Plates of the calyx smooth or finely granu- lose. Tegmen almost flat, com- posed of a large number of small plates. Arms 10, strong, simple and biserial. Stem round. Lyriocrinus dactyhis Hall (Fig. 51) (1852. Pal. N. Y. 2:197, pl- 44) Distinguishing characters. Stem near the calyx of alternating- larger and smaller joints, the larger projecting much beyond the. Fig. 51 Lyriocrinus dactylus. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Buffalo Society of Natural Sciences. Buffalo, N. Y. : Buffalo Society of Natural Sciences
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