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382 THE CRINOIDEA CAMERATA OF NORTH AMERICA. 
wider than long, larger than both costals together. Costals nearly equal in 
size; the first quadrangular, wider than long; the second heptagonal, a little 
wider than the first. Distichals two, transversely arranged; those of the 
three anterior rays followed by four to five short palmars, which support the 
free arms. The palmars of the two lower rows are as large as the distichals 
and resemble them in form, the upper ones curved like arm plates and 
smaller. The two posterior rays have five to six arms, — exceptionally 
seven,— the other rays invariably four. In the two former, either both outer 
palmars of the second row are axillary, or only the one facing the anal side. 
Arms long, but comparatively thin ; rounded at the proximal end, slightly 
flattened at the distal one, and composed of two series of transverse pieces 
united by a zigzag suture, each plate covered with two delicate nodes 
arranged into longitudinal rows. Interbrachial plates: 1, 2,1. Anal piece 
narrower and longer than the radials; followed by three or four plates, and 
these by four to five others of irregular arrangement. Ventral disk hemi- 
spheric; the plates tuberculous and of similar size, except those at the pos- 
terior side which are somewhat smaller. Anal tube very long and stout, 
extending far above the tips of the arms; the plates rather large, pentagonal 
or irregularly hexagonal, and each one covered with a sharp central node. 
Column large, the nodal joints angular at their edges, and considerably 
wider than the intervening ones, which, however, increase in width as they 
pass downwards. 
Horizon and Locality. — Keokuk group; Crawfordsville, Ind. 
Types in the Lyon collection. 
Remarks. — This species is labeled in several collections Hretmocrinus 
magnificus, which is a totally different species. White’s Actinocrinus Wachs- 
muthi is identical with this species, 
Batocrinus mundulus (Hat1). 
Plate XXX. Figs. 4a, b, and 3S. 
1859. Actinocrinus mundulus — atu; Suppl. Geol. Rep. Iowa, p. 39. 
1881. Batocrinus mundulus —W. and Sp.; Revision Paleocr., Part IL., p. 167. 
Syn. Actinocrinus similis — Hatt, 1859; Suppl. Geol. Rep. Iowa, p. 40. 
Syn. Batocrinus similis —M. and W. ; Geol. Rep. Illinois, Vol. V., p. 368. 
A small species. Calyx higher than wide; the dorsal cup gradually 
spreading; its base broadly truncate; the sides straight or a little convex. 
Radials and brachials marked by transversely arranged, obscure angular 
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