LARVIFORM CRIXOIDS 



23 



least developed, a condition that has also been noticed in specimens of certain 

 other species. 



The oral crown is rather flat and rises abruptly from the radials. In 

 diameter it is only slightly larger than the basal disc and it does not wholly 

 cover the ventral surface of the cup. The individual plates are shallowly 

 excavated and the posterior one bears a pustule indicating the position of the 

 madrepore. 



The surface of the holotype, which is a silicified specimen, is minutely 

 pitted. This probably represents the original porous structure of the plates. 



Remarks. — This species resembles K. pocillus in size, in the small oral 

 crown, and in the large and strong articular processes. However, its general 

 form, produced by the angulated radials, serves to distinguish it from the 

 other which is composed of convexly rounded radials. 



Occurrence. — The holotype is from a limestone near the base of the 

 Pennsylvanian section near the center of the N. ]/i sec. 35, T. 21 N., R. 9 W., 

 Warren County, Indiana. 



Kallimorphocrinus sp. 



Description. — The calyx of this poorly preserved specimen is a little 

 less than 1.5 mm. in height and the greatest width is somewhat less. The 

 radials form about two-thirds, and the basal disc and oral dome each make 

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



The basal disc has a diameter equal to about two-thirds of the greatest 

 width of the calyx and is only slightly larger above than below. 



The radials are subrectangular and only slightly wider above than below. 

 Their height is about twice their width. Each radial is medianly angulated 

 and the surfaces slope off on either side to meet the adjoining radials and 

 form the flat lateral sides of the calyx, giving the whole body a truncated 

 pyramidal form. 



The articular facets of the radials are largely obliterated and none of the 

 details can be made out. 



The oral crown is subhemispherical in form and does not overhang the 

 radials. Its diameter is about equal to that of the basal disc. 



The surface of the calyx is badly worn or weathered. Its uneven rough- 

 ness suggests that the plates are spicular and porous. 



Remarks. — This specimen most closely resembles K. indianensis but its 

 basal disc is much stouter and it lacks deep notches at the upper corners of 

 the radials. It occurs at a much higher horizon and is probably a distinct 

 species but it is impossible to adequately characterize it from the single im- 

 perfect specimen obtained. 



Occurrence.- — This specimen was collected from a thin layer of argilla- 

 ceous limestone beneath the thick quarry bed near the south end of the large 



