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BATOCRINID ZA. 425 
twice as long as wide. Interbrachials two or three on the regular sides, 
three to six on the posterior; arched by the palmars. Anal plate a little 
higher than the radials, occasionally followed by two plates in the second 
range in place of three; the second anal, although present, not in contact 
with the first. Ventral disk highly convex, slightly conical, the plates 
nodose and of irregular arrangement. Anal tube slender, almost central. 
Column thin; composed of larger and smaller joints. 
Horizon and Locality. — Warsaw limestone, near Huntsville, Ala., Tate- 
ville, Pulaski Co., Ky., Boonville, Mo., and Lee Co., Va. | 
The type specimen, which is from Union Co., Ills., is in the (Worthen) 
Illinois State collection. 
ftemarks. — This species is very interesting as having sometimes in the 
posterior interradius but two plates above the anal piece, in which it shows 
a tendency toward the Actinocrinide. It also has a wide geographical 
range, and may be regarded as one of the leading forms of the lower part of 
the Warsaw limestone, but occurs already in the Upper Keokuk beds. 
Actinocrinus Caroh Hall is very possibly identical with this species, but 
the type in the Illinois State collection at Springfield is too imperfect for 
accurate definition. 
Dizygocrinus unionensis, var. divalis (S. A. Mintzr). 
Pluie XXXV. figs. 21, 22,.28, 24. 
1892. Batocrinus divalis—§8. A, Minter; Adv. Sheets 18th Rep. Geol. Surv. Missouri, p. 22, Plate III., 
Figs. 6 and 7. 
A little larger than the typical form; the dorsal cup more expanded, the 
ventral disk somewhat more conical, but so closely resembling it in its general 
habitus, in the form and arrangement of the plates and their ornamentation, 
that the two cannot be distinguished unless the arms are preserved. Arms 
double from their origin, thirty-six in fully developed specimens, rather stout 
and densely crowded. Arm joints of more than medium length. At the 
four regular sides, the interbrachials consist of three to four pieces, at the 
anal side of from six to eight. 
Horizon and Locality. — Associated with the preceding form at Boonville, 
Mo., and at Huntsville, Ala. 
Types in the collection of Mr. 8. A. Miller. 
Ltemarks. — That we have here a mere variety of Dizygocrinus unionensis, 
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