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SMITHSONIAN INSTITUTION 
Pycnosaccus dubius Springer 
Plate 21, figs, g, ga 
springer, Crinoidea Flexibilia, 1920, p. 189, pi. 13, figs, iia, b. 
Beech River formation; Decatur County, Tennessee. 
Family SAGENOCRINIDAE Roemer emend. Springer* 
Infrabasals more or less recumbent, taking little part in calyx wall. Crown 
usually elongate. Rays above radials partly or wholly separated. 
SAGENOCRINUS Austin 
Plate 22 
Sagenocrinites Austin, Ann. Mag. Nat. Hist., 1842, p. iio.—Sagenocrinus Springer, Crinoidea Flexibilia, 
1920, p. 215. 
RA obliquely under r. post, ray, more or less between BB. Post. B truncate. 
Anals and iBr numerous. Arms dichotomous, not abutting. 
Genotype. Actinocrinites? expansus Phillips. 
Distribution. Silurian ; England, Gotland, America. 
Sagenocrinus clarki Springer 
Plate 22, figs. 4, 4a 
Springer, Crinoidea Flexibilia, 1920, p. 220, pi. 19, figs. 4a-d. 
Beech River formation; Decatur County, Tennessee. 
Sagenocrinus americanus Springer 
Plate 22, fig. 5 
springer. Am. Geol., 30, 1902, p. 86; Crinoidea Flexibilia, 1920, p. 221, pi. 19, fig. 5. 
Waldron shale; Waldron, Indiana. 
Eamily ICHTPIYOCRTNIDAE Angelin emend. Wachsmuth and Springer 
Infrabasals horizontal, not appearing externally and taking no part in the 
calyx wall. Crown elongate or rotund. Rays widening upward to accommo- 
date expansion of calyx, but in close contact, usually interlocking or abutting 
above interbrachials. 
ICHTHYOCRINUS Conrad 
Plate 22 
Ichthyocrimis Conrad, Jour. Acad. Nat. Sci. Phil., 8, 1842, p. 279. — Springer, Crinoidea Flexibilia, 1920, 
p. 264. 
Rays in contact all around. RA in form of R under r. post. R. No anal or 
iBr. Post. B not differentiated. Arms dichotomous, interlocking. 
Genotype. lehthyocrinus laevis Conrad. 
Distribution. Silurian to Devonian ; America, England, Gotland, Bohemia. 
