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626 THE CRINOIDEA CAMERATA OF NORTH AMERICA. 
nized. Anal tube very long and slender; composed of small, transverse, 
flat pieces. Column moderately thick; the nodal joints long, a little project- 
ing, and their outer edges slightly convex; the axial canal large and sharply 
pentangular. 
Horizon and Locality. — Upper Burlington limestone; Burlington, Iowa. 
Type in the (Worthen) Illinois State Collection, Springfield. 
Lemarks.— This is a variable species, and the only one of the genus 
surviving the Lower Burlington bed. The plates of the calyx vary from 
scarcely convex to highly nodose; specimens having the first kind of plates 
were described as Actinocrinus glans, and those with the latter as A. tholus. 
Under Actinocrinus eryx Hall redescribed a third species, in which the arms 
and anal tube were preserved, but unfortunately, in his photographic plates 
of eleven years later, he confounded the specimen, which we have examined 
in the Museum of Comparative Zodlogy, with Periechocrinus White, a species 
with branching arms, and without anal tube. 
TELEIOCRINUS W. and Spr. 
1881. W. and Sp.; Revision Paleocr., Part IT., p. 146 (Proceed. Acad. Nat. Sci. Phila., p. 320). 
1889. S. A. Minter; North Amer. Geol. and Paleont., p. 286. 
Syn. Calathocrinus Wau; 1861 (aot von Meyer 1848) in part; Descr. New Paleeoz. Crin., p. 12. 
Syn. Strotocrinus (Section B) Mrzx and WortueEn; Geol. Rep. Illinois, Vol. IT., p. 190. 
A modified and extravagant form of Cactocrinus. Calyx obconical to the 
base of the palmars, then spreading horizontally, and forming a broad and 
continuous rim around the calyx, from the outer margins of which the free 
arms are given off to the sides. Ventral disk short, supporting a long, 
nearly central anal tube. Ornamentation of the dorsal cup similar to that 
of Actinocrinus and Cactocrinus, but somewhat coarser, and the nodes more 
conspicuous than the striations, often obscuring the latter. Basals three, 
large, massive, more or less projecting beyond the sides of the column. 
Radials and costals generally as long as wide or longer, but the costals in 
proportion considerably smaller. Distichals 1 < 10, all axillary, separating 
the rays into two divisions (but not into lobes), which subdivide by alternate 
bifurcation from every successive brachial to the last in the calyx, which 
bears two simple arms. ‘The successive orders of brachials of the two divi- 
sions are very numerous; they invariably consist of a single row of plates, 
and in each order only the plate of one side bifurcates again; the opposite 
one is truncate, and is followed by a variable number of other plates of the 
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