ns Se Reni aa ner cane in Sed 
HEX ACRINID ZA. 789 
| 
| in the first row, which is followed by a smaller one. The anal interraduus, 
| which is much the widest, has one plate in the two proximal rows, followed 
| by small pieces forming a little protuberance around the anus. Orals repre- 
sented by a single piece, from the sides of which the covering plates of the 
ambulacra pass out to the arms; the plate is highly convex or nodose, and 
as large as the five orals in other species. Ambulacra projecting, the cover- 
ing plates consisting of two rows of small pieces, which are alternately 
arranged; they bifurcate on a rather large axillary, and the two branches 
are separated by a large interdistichal. 
Horizon and Locality. — Upper part of St. Louis group; Tateville, ) J 
Pulaski Co., Ky. 
Types in the collection of Wachsmuth and Springer. 
) 
4 
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ae , 
Remarks. — This species is remarkable for having but a single oral plate ; | 
the other four orals are either undeveloped, or, more probably, were resorbed | 
in the growing crinoid. Another peculiarity of this species is the absence of 
e e e e e ¥ 
spines, and the presence of regular covering pieces in the disk. 
Meek and Worthen’s Dichocrinus constrictus may possibly be identical ) 
with this species, but as only the basals and radials are known no satis- | 
factory comparison can be made. 
Talarocrinus subglobosus W. and Sp. (nov. spec.). 
Plate LX XIX. Figs. La, 0. 
A small species. Calyx proportionally shorter than in 7. decornis, and 
subglobose instead of ovate; the interradial spaces depressed at the arm 
regions; plates of the dorsal cup rounded and a little convex; suture lines 
somewhat grooved. | 
Basal cup small and quite shallow ; widest at right angles to the suture 
line; the lower face slightly excavated. Radials about as wide as long, 
rapidly spreading from the base upward, tumid, and a little inflected at the 
upper part; radial facets broadly excavated, and the limbs slightly truncated 
for the reception of the interbrachials. Anal plate larger than the radials 
and considerably widest across the middle. Costals quite large for the genus, 
filling almost the entire width of the facets in which they rest. Distichals 
2 X 2, short, those of the first range slightly touching the radials, and all, 
together with the costals, facing outward. Arms four to the ray, free above 
the distichals. Ventral disk subpyramidal, a little shorter than the dorsal 
