336 THE CRINOIDEA CAMERATA OF NORTH AMERICA. 



Eucalyptocrinus coelatus (Hall). 

 Plate LXXXIIL Figs. 5, 6, 7. 



1843. Geol. Rep. 4th Distr. N. York, p. 113, Eig. 1, and Palgeont. N. Y., p. 210, Plate 47, Pigs. 4«, b, c, d. 

 1885. W. and Sp. (in part) ; Revision Palseocr., Part 111., p. 133. 



Not Eucalyptocrinus coelatus Hall, 1865, Trans. Albany Inst., p. 226 (Abstr., p. 32), and 20th Rep. 



N. Y. State Cab. Nat. Hist., pp. 321 to 329 (second ed., pp. 363-364), and 28th Rep., p. 142, 



Plate 16, Pigs. 1-10, and Plate 19, Pigs. 1-3; also 11th Ann. Geol. Rep. Indiana, p. 274, Plate 



15, Pig. 1, Plate 16, Pigs. 1-10, Plate 19, Pigs. 1-3, all of which we refer to Eucalyptocrinus 



Elrodi S. A. Miller. 

 Nor Eucalyptocrinus coelatus Roemee,; Silur. Pauna West. Tenn., p. 48, Plate 4, Pigs. Za-e^= 



E. ventricosus. 

 Syn. (?) Eucalyptocrinus (Jlypanthocrinus) decorus Hall, 1843 (not Murchison, 1839) ; Geol. Rep. 



4th Distr. N. York, p. 113, Pigs. 2-3, and 1852, Pal^ont. N. York, Vol. IL, p. 207, Plate 47, 



Pigs. 1-3, and Plate 85, Fig. 7. 

 Syn. Eucalyptocrinus papulosus Hall; Palseont. N. York, Yol. II. , p. 211, Plate 47, Pigs. 5a, b. 



Of medium size. Length of crown compared with the greatest width at 

 the arm bases as 3 to 1, and with the height of the dorsal cup as 3 to 2. 

 The cup subturbinate, uniformly spreading from the middle of the radials to 

 the arm bases, the bottom part somewhat rounded. The plates of the cup 

 densely crowded with small pustules of uniform size, and similar pustules, or 

 small nodes, cover the outer edges of the partition walls to half their height ; 

 the upper part being marked by indistinct transverse ridges. 



Basal concavity small, completely filled by the upper part of the column. 

 Radials large, wider than long, very slightly inflected, their lower ends thick- 

 ened by a round, wart-like projection, which is devoid of ornamentation ; the 

 sloping upper faces short; the upper face concave. First costals wider than 

 long, the sides all convex, the upper face narrower than the lower. Second 

 costals the size of the first, but pentangular. First distichals smaller than 

 the costals ; the second smaller than the first. Plates supporting the arms 

 small and irregularly quadrangular. First interbrachial very large, longer 

 than wide, and tapering downward ; the two succeeding ones together almost 

 as large as the first ; they rise to a level with the third arm joints, are wider 

 at the bottom than at the top, and unite by a vertical suture. The interdis- 

 tichals rarely touch the axillary costals ; they are twice as long as wide, and 

 one third narrower than both upper interbrachials together. Partition walls 

 almost as thick at the upper end as at the lower, and distinctly rounded on 

 the back. Arms tapering upward to fully one half their greatest width. 

 The four proximal arm plates single and somewhat longer than the others ; 

 the two succeeding ones cuneate, and those above arranged in two series, 

 which deeply interlock. The arms are covered with transverse rows of elon- 



