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THE CRINOIDEA CAMERATA OF NORTH AMERICA. 
Batocrinus quasillus (Merx and Worrs.). 
Plate XX VITT. Figs. 4a, b. 
1869. Batocrinus quasillus — Murex and Wortunn; Proceed. Acad. Nat. Sci. Phila., p. 252; also Geol. 
Rep. Illinois, Vol. V., p. 369, Plate 5, Fig. 2. ; 
1881. Batocrinus quasillus —W. and Sr.; Revision Paleocr., Part I1., p. 167 (Proceed. Acad. Nat. Sci. 
Phila., p. 341). 
Height of the calyx equal to its width ; the ventral disk occupying fully 
one half. Dorsal cup wide at the bottom, rapidly spreading near the arm 
bases, so as to place the upper rows of brachials in a horizontal position. 
Plates extremely heavy and evenly convex. 
Basal cup three times as wide as high, hexagonal, thickened at the lower 
end; the interbasal sutures slightly indented; the bottom deeply depressed 
for the reception of the column. Radials nearly twice as wide as long, the 
upper face concave. First costal very small; the second more than twice 
as long as the first. Distichals two; followed by two rows of two palmars 
each, except in the divisions facing the anal side, where the first distichal is 
axillary and supports an axillary palmar, and this 2 X 2 post-palmars. Arms 
twenty-two to twenty-four, arranged at equal distances, openings directed 
horizontally.. Interbrachials two, the upper very small, arched over by the 
palmars. Anal plate a little narrower and longer than the radials, succeeded 
by three good-sized plates, and these by a single one. Ventral disk highly 
convex, inflated near the periphery so that its sides project sometimes be- 
yond those of the dorsal cup. Orals and radial dome plates somewhat tu- 
berculous, and twice as large as the surrounding pieces which are merely 
convex. Anal tube very strong, composed of thick plates; its length not 
known. 
florizon and Locality. — Lower Burlington limestone ; Burlington, Iowa. 
Type in the Museum of Comparative Zodlogy. 
Batecrinus lepidus (Hatz). 
Plate X XVIIT. Figs. 2 and 3. 
1860. <Actinocrinus lepidus — Wauu; Suppl. Geol. Rep. Iowa, p. 33. 
1881. Batocrinus lepidus —W. and Sp.; Revision Paleocr., Part II., p. 167. 
1893. Batocrinus lepidus — Wurrrie.p ; Mem. Amer. Mus. Nat. Hist., Vol. I., p. 16, Plate 1, Figs. 17, 18. 
A little larger than the two preceding species. Calyx wheel-shaped, 
abruptly spreading beneath the arm bases; ventral disk depressed convex, 
with a central anal tube rising abruptly from the summit. Plates smooth, 
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