198 PROCBSDINOS OF Tits }^ATi6KAL MV^BVM. vol.41. 



upward. Surface very finely and uniformly granulose, the granules 

 sometimes forming fine strise toward or parallel with the margins of 

 the plates. Comparable in general form with C.fragilis of the Lower 

 Burlington, wliich lacks the granulose surface. A reconstructed 

 calyx. 



Locality. — Button-mould Knob, Kentucky. 



6. Rotund, medium size, wdth tliick plates. IBB low; BB rather 

 longer than wide, strongly convex and gibbous; RR smaller than BB, 

 with large projecting facets facing outward. Surface finely granu- 

 lose. Except for the distinct granulose ornamentation, tliis form 

 may be compared with C. nodosus of the Keokuk; also with C. bursa 

 and C. calcaratus of the English Mountain hmestone. It is probably 

 the same species described by Meek and Worthen as C. saffordi and 

 by Troost (MS) as C. fentasyhericus} 



Locality. — Button-mould and Bradbury Knobs and Newmarket, 

 Kentucky; from the latter two complete calices. 



7. Medium sized; elongate, campanulate, narrow at base and 

 abruptly widening at the arm bases owing to the large size of RR, 

 which constitute nearly one-half of the calyx. IBB small, erect ; BB 

 about half the size of RR; facets large, facing outward. AU plates 

 smooth, BB and RR low convex, without ornament, or with possibly 

 some low obscure pustules on BB only, not on RR. In its turbinate 

 form and smooth surface tliis can only be compared with C. cJioteauefi- 

 sis of the Missouri Choteau. 



Locality. — Only identified at Wliites Creek, where a specimen was 

 found in place in the Knobstone beds; but smooth radials probably 

 of the same species are frequent at the Knobs. 



8. Similar in general form and proportion of plates to the last; but 

 more strongly campanulate. All plates gibbous, with a few large, 

 rough pustules in the median parts and bordering the facets. It is 

 very similar in form to C. harydactylus, from the highest part of the 

 Upper Burlington. 



Locality. — Good calices were found at Whites Creek in washes below 

 the Knobstone, but it was not identified at the other localities. 



Wliile some of the foregoing species of Cyathocrinus are undoubtedly 

 indecisive of the horizon, yet it can not be denied that the entire 

 facies is suggestive of the Dower Burlington in a more luxuriant 

 development than at the typical locality. It is significant that 

 in all the careful collecting made at the true Keokuk localities in 

 Barren, Metcalfe, and Allen counties, Kentucky, by Lyon, Wachs- 

 muth, and Wetherby, not a single specimen of any of these species 

 appears, and that none of them are among the fossils found in place 

 in the Keokuk beds by Bassler and Braun at Wliites Creek. 



> BuU. 64, U. S. Nat. Mus., p. 84, pi. 5, figs. 6, 7, 8. 



