20 LARVIFORM CRINOIDS 



pies the center of each radial, becoming sharper and more prominent above 

 and terminating in a small, narrowly rounded or subangular knob. The upper 

 corners of the radials are beveled, forming rounded depressions in which 

 the orals rest. 



Articular processes are not preserved on any of the radials. Their area 

 is quite small and but little wear would be required to obliterate them. 



The oral plates rise sharply above the radials and form a gently convex 

 crown each of whose five lobes overhangs the calyx below. Shallow concave 

 depressions occupy the upper surfaces of the orals. 



The surface of the holotype is smoothly polished but completely covered 

 by minute irregularities which can be seen only when the specimen is mag- 

 nified some twenty-five or more diameters. This probably does not represent 

 original ornamentation of the surface but is due to a very slight amount of 

 solution. 



Remarks. — This species, which is based upon a single individual, is quite 

 similar in a general way to some forms of the K. astrus series, but in its 

 combination of characters it differs from any of the K. astrus forms examined. 

 This is particularly true in regard to the higher basal disc and less prominent 

 knoblike processes of the radials in an individual whose width is greater than 

 its height, and also in the comparatively larger and more overhanging oral 

 plates. It might be questioned whether these distinctions are sufficiently 

 important to justify specific discrimination from the K. astrus series, but 

 they probably are, inasmuch as A'. lilius occurs at a considerably higher 

 horizon. 



Occurrence. — The single specimen of K. lilius was collected by Air. J. B. 

 Knight from calcareous shale immediately below the Piasa limestone in the 

 hollow just north of the right angle west turn of Scheute Road, half a mile 

 southwest of Lackland Station on the Chicago. Rock Island and Pacific 

 Railway and three quarters of a mile north of Stratman, St. Louis County, 

 Missouri. 



Kallimorphocrinus indianensis J. M. Weller, n. sp. 

 Plate I, figs. 9a-b 



Description. — The holotype is 1.41 mm. in height, of which the radials 

 form about three-fourths. The greatest width is somewhat less than the 

 total height, being approximately equal to the combined height of the basal 

 disc and radials. A cross-section through the upper part of the radials is 

 nearly pentagonal, with only slightly concave sides. 



The basal disc is low and broad. Its height is about one-tenth of the 

 total height and its width somewhat less than half the greatest width of the 

 cup. It slopes gently outward above the circular stem facet which occupies 

 its whole proximal surface. 



