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BATOCRINIDZ. 929 
catur Co., Tenn., and there is but little doubt that the one described by 
Roemer, and provisionally referred by him to Saccoerinus speciosus Hall (Silur. 
Fauna West. Tenn., Plate 3, Fig. 3), represents the same species. We have 
in our collection several specimens from that locality with four arms to each 
ray, but none with three in the posterior rays, as shown in Roemer’s figure, 
which is said to be a restoration. The specimen described afterwards by 
Hall is a natural cast in the Ohio State Cabinet. 
Periechocrinus Howardi (8. A. Miuuer). 
1892. Saccocrinus Howardi —S. A. Mittzr; Adv. Sheets 18th Rep. Geol. Surv., Indiana, p. 30, Plate 5, 
Figs. 3 and 4. 
A small species. Calyx higher than wide, broadly truncated at the base, 
and but slightly expanding, so as to be almost subcylindrical to near the 
arm bases, which bend abruptly outward. Plates tumid, without ornamen- 
tation; suture lines beveled. 
Base short, forming a broad rim, which is squarely truncated at the bot- 
tom; its diameter equal to two thirds the greatest width of the cup. Radials 
more tumid than the other plates, about as wide as long. First costals two 
thirds the size of the radials; the second much smaller. Distichals three, 
directed almost at right angles to the axis of the calyx; supporting the free 
arms. Arm openings ten, arranged in pairs, each pair separated by numer- 
ous interradial plates, which connect with the plates of the tegmen. Inter- 
radial areas composed of two or three large tumid plates, followed by smaller 
ones. In the type specimen there is but one large plate in the second row 
at the regular sides, probably the usual two being consolidated. Anal area 
much wider and somewhat flattened, the plates rising almost vertically. Anal 
plate followed by 8, 3, and 5 interbrachials; those of the latter row irregu- 
larly arranged. Ventral disk almost on a level with the arm bases, only the 
central part a little convex ; composed of numerous small plates without defi- 
nite arrangement. The anal opening marginal. 
Horizon and Locality. —Niagara group; St. Paul, Shelby Co., Ind. 
Remarks. — Being unable to obtain the type specimen, our description is 
made aiter Miller. 
67 
