348 THE CRINOIDEA CAMERATA OF NORTH AMERICA. 
Eucalyptocrinus magnus Worruen. 
Plate LX XXII. Figs. 7, 8. 
1875. WortHen; Geol. Rep. Illinois, Vol. VI., p. 501, Plate 25, Fig. 3. 
1885. W. and Sp.; Revision Paleocr., Part IIIL., p. 133. 
Syn. Eucalyptocrinus Gorbyi S. A. Mituen; Adv. Sheets 17th Rep. Geol. Surv. Missouri, p. 39, 
Plate 7, Figs. 5, 6. 
A large species. Dorsal cup depressed turbinate, height and width about 
as seven to ten; the lower end obtusely conical, rapidly spreading from the 
top of the radials to the top of the first distichals, then abruptly turning 
upwards until at the upper end the sides are parallel with those of the oppo- 
site side. The upper interbrachials somewhat depressed, so as to give to the 
cup, as seen from above, an obscurely pentalobate outline. Plates almost 
flat ; the surface smooth or finely granulose ; suture lines slightly grooved. 
Basal concavity narrow, completely filled by the column. Radials, as 
exposed to view, wider than long, rapidly spreading upward, their upper 
faces twice as wide as the lower. First costals somewhat smaller and quad- 
rangular ; the sides slightly convex. Second costals heptangular, wider and 
longer than the first ; the sloping upper faces convex and unusually steep ; 
the upper angle broadly truncated by the interdistichal. First distichals as 
large as the axillary costal; the second less than half the size of the first; 
the arm-bearing palmars trigonal and quite small. First interbrachials the 
largest plates of the cup; decagonal, but sub-rhomboidal in outline; the sides 
more or less concave. The two plates of the second row together wider than 
the first, with re-entering angles at the upper and lower ends.  Interdis- 
tichals large, elongate, rising to the height of the fifth arm plate, the sides 
facing the costals concave, the upper and lower faces broadly truncated. Of 
the arms only a few of the lower plates were preserved, which are extremely 
short. The partition walls are broken away in the specimens, but were, to 
judge from the places for their attachment, unusually heavy. 
Horizon and Locality. — Niagara group; White's creek, near Nashville, 
Tenn., and Decatur and Wayne Cos., Tenn. 
Type in the collection of Prof. 8. 8. Gorby. 
Remarks. — This species is most remarkable for its large size, and is 
readily distinguished from all other known species by its peculiar form. 
