el 
BATOCRINIDZ. 421 
subeircular with a small notch at the upper end, and provided with a trans- 
verse, imperforate ridge. Arms single, so far as can be ascertained from the 
facets; their structure not known. Regular interbrachials: 1, 2, 2; the first 
large and considerably wider than high; the upper range, which sometimes 
consists of but one plate, arched by the palmars. Anal plate short, followed 
by seven or eight plates. Ventral disk conical, surmounted by a large, 
nearly central anal tube. Plates of the disk comparatively large and tumid ; 
the orals somewhat larger and in contact; the posterior one erect, and 
forming a part of the tube. Ambulacral plates represented by three sharply 
nodose plates of a first and second order. 
Horizon and Locality. — Warsaw limestone; Spergen Hill, Ind., and 
Barren Co., Ky. 
ftemarks. — This species has its closest affinities with D. Whitei W. and 
Sp., but the cup is less deep, and the tegmen in proportion much higher. 
Dizygocrinus originarius W. and Sr. 
Plate XX XITI. Figs. La, b. 
1881. Evretmocrinus originarius — W. and Sp.; Revision Paleocr., Part IT., p. 174. 
Syn. Hretmocrinus varsoviensis — WoRTHEN ; 1882, Geol. Rep. Illinois, Vol. VIL., p. 306, Plate 28, 
Fig. 14. 
A small species of the type of Dizygocrinus Whitet. Calyx biturbinate, as 
high as wide; the dorsal cup a little higher than the ventral disk, with almost 
straight sides and broadly truncated base; arm regions projecting, and some- 
what indented at the interradial spaces. Plates slightly convex, covered 
with obscure granules, and the radials and brachials marked by a faint longi- 
tudinal ridge, which bifurcates and sends branches to the arms. 
Basals a little larger than in any of the preceding species; forming 
a short, broadly truncated cup, with a shallow columnar depression, the 
sides somewhat projecting and slightly grooved at the sutures. Radials as 
large as both costals together, wider than long. First costals quadrangular, 
twice as wide as long; the second a little wider and pentangular. Distichals 
two or three; the anterior ray has three, followed by arm plates; the antero- 
lateral rays two, followed by two rows of small palmars; the posterior rays 
have two at one side, followed by 2 X 2 palmars, and at the opposite one 
three successive distichals. Arms sixteen, simple, stout in proportion to the 
small size of the species, rather short, and somewhat flattened at the tips; 
they are composed from the second plate up of two series of pieces, which 
