LARVIFORM CRIXOIDS 21 



The radials are elongated and are wider above than below. Their height 

 is somewhat more than twice their mean width. A sharp angulation occupies 

 a central position, rising from the general curvature of the basal disc at the 

 base of the radial, becoming stronger and more prominent upward, and ending 

 above in the articular facet. Upon either side of the articular facet the radials 

 are beveled, producing gently concave surfaces into which the orals extend. 



The articular facets are strong and well developed although they occupy 

 only about one-third the upper width of the radials. The angulations of the 

 radials are beveled above, producing triangular facets which rise to the trans< 

 verse articular ridges. Behind each transverse ridge and at the bottom of a 

 concave area bounded by radial ridges is the opening of the axial canal. 



The orals are prominent though not overhanging and form a five-lobed 

 crown rising above the radials. Their upper flattened surfaces are shallowly 

 concave. The ambulacral openings penetrate between the orals at a position 

 about midway above the articular surfaces of the radials. 



• The surface of this specimen which is entirely silicified is very uneven. 

 Although this may be the result of alteration, it is probably due, at least in 

 part, to the original structure and porous texture of the plates. 



Remarks. — This species which is based upon a single specimen is so 

 distinctive that it is unnecesary to compare it with the other forms described. 



Occurrence. — The specimen is from dark limestone near the base of the 

 Pennsylvanian strata in the center of the N. l / 2 sec. 35, T. 21 N., R. 9 W., 

 Warren Count} - , Indiana. 



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



Plate I, figs. 6a-b 

 Description. — The height of the holotype, exclusive of the stem joint 

 attached to the calyx, is 1.30 mm. and is equalled by the greatest width. The 

 radials make up three-fourths, the basal disc about one-ninth, and the oral 

 crown about one-sixth of the total height of the calyx. 



The entire lower surface of the basal disc is occupied by the stem facet 

 above which the disc enlarges very slightly to its scalloped upper border upon 

 which the radials rest. The diameter of the basal disc is equal to about half 

 the greatest width of the calyx. 



The radials are subrectangular in outline and only slightly wider above 

 than below. They are about twice as high as wide. Median angulations 

 developed longitudinally on the radials become progressively more prominent 

 above and are terminated by subtriangular beveled surfaces which rise to the 

 transverse ridges of the articular facets. The upper corners of the radials 

 meet in shallow concave depressions occupied by the outer edges of the orals. 



