. Bulletin - New York State Museum. Science. 156 NEW YORK STATE MUSEUM terradial plates. Lower brachials forming a part of the calyx; cost.^ hexagonal, cost.^ 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^ pl- 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, th
. Bulletin - New York State Museum. Science. 156 NEW YORK STATE MUSEUM terradial plates. Lower brachials forming a part of the calyx; cost.^ hexagonal, cost.^ 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^ pl- 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 ,^^' ^ ^\ tiiick, most irregular near the i 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 : A6/)jov, small lyre; x/)cVr>v,lily], (1852. Y. 2:197) 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- Fig. 51 Lyriocrinus dactylus ^^^^^ ^^ ^ ^^^^^ HUmbcr of Small plates. Arms 10, strong, simple and biserial. Stem round. Lyriocrinus dactylus 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. 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 New York State Museum; New York State Museum. Albany : New York State Education Dept
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1887
