CALYPTOCRINIDZ&. 349 
Eucalyptocrinus depressus S. A. Mitrrr. 
Plate LXXXITIT. Figs. 3, 4a, 4b. 
1880. S. A. Minter; Journ. Cincin. Soc. Nat. Hist., Vol. IIL., p. 252, Plate 7, Figs. 1, la, 4. 
1885. W. and Sp.; Revision Paleocr., Part ILI., p. 183. 
Of moderate size. Crown subcylindrical, twice as high as wide, a little 
tapering to the upper end, distinctly flattened and concave at the poles. 
Dorsal cup almost twice as wide as high, the upper part of the radials and 
the extreme ends of the first interbrachials forming the truncated bottom, 
the upper part of the latter and the first costals gently curving upward, the 
plates above parallel to those of the opposite side. Plates a little convex, 
their surface apparently rugose. Lower concavity deeply and broadly fun- 
nel-shaped, the basals constituting but little more than the bottom part. 
Radials slightly longer than wide; their upper half more or less hori- 
zontal in position, and not visible from a side view ; the lower half forming 
the slanting sides of the concavity; their sloping upper faces rather long. 
First costals twice as wide as long, a little shorter than the second at the 
median line; the upper end of the latter slightly truncated by the inter- 
distichal. First distichals about a third smaller than the upper costals; the 
second half the size of the first, their upper angles quite obtuse; the first 
palmars very small and pentangular. First interbrachial subrotundate, as 
long as wide, those of the second row as long, but together narrower than 
the first, their upper ends rising to the base of the second arm plates. The 
interdistichal has almost the form of the two upper interbrachials, but is 
somewhat smaller. Partition walls nearly twice as long as the dorsal cup, 
moderately thin, the outer edges rounded to near the top, then slightly widen- 
ing and curving abruptly inward and somewhat downward, so as to form a 
shallow depression around the summit. Their upper ends enclose five rather 
large plates with a pentangular open space, the overlying plates being not 
preserved in the specimen. The height of the calyx, as observed in the casts, 
is about equal to the greatest width across the first distichals, and that of 
the dorsal cup equal to that of the tegmen but narrower; the tubular pro- 
longation above almost as long as the rest of the calyx, widening at both 
ends. Of the arms only the proximal plates are preserved, which are com- 
paratively long. 
Horizon and Locality.— Niagara group; Cicero and Bridgeport, near 
Chicago, IIls. 
