348 THE CRINOIDEA CAMERATA OF NORTH AMERICA. 



Eucalyptocrinus magnus Worthed. 

 Plate LXXXII. Figs. 7, 8. 



1875. WoRTHEN ; Geol. Rep. Illinois, Yol. VI., p. 501, Plate 25, Pig. 3. 

 1885. ^W. and Sp. ; Revision Paleeocr., Part IIP, p. 133. 



Syn. EMcali/ptocrinus Gorhyi S. A. Miller ; Adv. Sheets 17tli Rep. Geol. Surv. Missouri, p. 39, 

 Plate 7, Pigs. 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. Kadials, 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. 

 Ti/pe in the collection of Prof. S. S. Gorby. 



Remarks, — This species is most remarkable for its large size, and is 

 readily distinguished from all other known species by its peculiar form. 



