TAXOCRINIDAE 
Ichthyocrinus subangularis Hall 
Plate 22, figs. 12, ig 
Ichthyocrinus subangularis Hall, Trans. Albany Inst., 4, i860, p. 201.— Springer, Crinoidea Flexibilia, 1920, 
p. 281, pi. 34, figs. i-io. 
Waldron shale; Waldron, Indiana. 
CLIDOCHIRUS Angelin 
Plate 21 
Clidochirus Angelin, Icon. Crin. Suecc., 1878, p. 12. — Springer, Crinoidea Flexibilia, 1920, p. 294. 
Rays in contact except at anal side. RA in form of R under r. post. R. 
Anal X alone or followed by others. Post B truncate. Arms dichotomous, 
interlocking'. 
Genotype. Clidochirus pyrmn Angelin. 
Distribution. Silurian to Devonian ; Gotland, America. 
Clidochirus americanus Springer 
Plate 21, figs. lo, ii 
Springer, Crinoidea Flexibilia, 1920, p. 298, pi. 37, figs. 7, 8. 
Clinton ; Dayton, Ohio. 
Suborder TAXOCRINOIDEA 
Family TAXOCRINIDAE Wachsmuth emend. Springer 
Posterior interradius always differentiated and occupied by anal plates in 
a tube-like series, none of which are incorporated in the calyx. All anal plates 
from post. B up separated by perisome from adjacent brachials at one or both 
sides. Distal face of post. B not suturally connected with anal plate. Rays above 
radials partly or wholly separated all around. Crown usually elongate. 
PROTAXOCRINUS Sp ringer 
Plate 22 
Protaxocrinus Springer, Crinoidea Flexibilia, 1920, p. 345. 
RA in form of R under r. post. R. iBr few. Rays wholly separated by iBr 
or perisome. Arms dichotomous. 
Genotype. Taxocrinus ovalis Angelin. 
Distribution. Ordovician, Silurian, Devonian ; Gotland, America. 
