CYATHOCRINIDAE 
133 
longitudinal angularity and its extremely narrow radial facets is so remarkably like the type, 
that we can readily conceive that the delicate arms would go with it, and that the other charac- 
ters probably are present. The genus has been but little known, and this specimen certainly 
shows how it ought to look, so I am venturing to place it accordingly, despite the difference 
in horizon. 
Horizon and locality. Beech River formation ; Decatur County, Tennessee ; type is from 
Waldron shale, Waldron, Indiana. 
^ (?) Lecythiocrinus problematicus new species 
Plate 31, figs, ii, iia, b 
Lecythiocrinus White, Proc. U. S. Nat. Mus., 2, 1880, p. 256, pi. i, figs. 4, 5. — Worthen, Geol. Surv. Illinois, 
7 , P- 31 ?! ph 31, fig- 8 . — Wachsmuth and Springer, Rev. Pal., 3, 1886, p. 228. 
Calyx small, low and broad. IBB 3, the small plate in r. post, position. 
BB unequal, all rather small except post. B, which is much the largest, rising 
high up between RR. RR large and massive, with facets deeply horse-shoe- 
shaped ; dorsal canal about the middle, and food groove at upper margin. Anal 
opening directly through the calyx wall at the junction of post. B and the two 
post. RR, carved about equally out of each of them. There is no plate above it 
analogous to an anal x, the two RR abutting directly. Tegmen apparently com- 
posed of interlocking orals, the sutures of which cannot be made out; ambulacra 
with alternating covering pieces pass from the radials under the orals. 
While this species has a strong superficial resemblance to some of the Devonian forms 
embraced in the subfamily Gasterocominae, it is definitely excluded from them by its lack 
of undivided infrabasal disk and peripheral axial canals, which are so characteristic of them. 
A later genus with which it would seem to agree in part is the little known Lecythiocrinus 
from the American Upper Carboniferous, having 3 IBB and a simple axial canal, but the 
radial facets are directed differently. Although not stated in the diagnosis, this genus is now 
known to have the anal opening through the dorsal cup as in the Gasterocominae, as was indi- 
cated by Worthen when describing L. adan'isi, and confirmed by specimens in my possession 
since discovered. Comparison should also be made with Hypocrinus of Beyrich from the 
Permian of Timor, fully described by Wanner in his treatise on the Timor crinoids. The 
reference here made is admittedly doubtful. 
Horizon and locality. Laurel limestone, Niagaran ; St. Paul, Indiana. 
CYATHOCRINUS Miller 
Plate SI 
Cyathocrinus J. S. Miller, Nat. Hist. Crin., 1821, p. 85.— Wachsmuth and Springer, Rev. Pal., i, 1879, 
p. 79; 3, 1886, p. 21. — Bather, Crin. Goth, 1893, p. 126; Treatise on Zooh, 3, 1900, p. 173. — Zittel- 
Eastman, Textb. Pah, 2d ed., 1913, p. 220. — Bassler, Bibliogr. Index, 1915, p. 316 (complete synonymy). 
IBB 5. No RA. Anal t in line with RR; anus at end of a tube short and 
rounded, or long with valvular pyramid at distal end. Radial facets horse-shoe- 
shaped, directed outward. Arms dichotomous, branching numerously at rather 
wide angles. 
Genotype. Cyathocrinus planus Miller. 
Distribution. Silurian to Low'er Carboniferous ; Europe and America. 
