18 LARVirORM CRIXOIDS 



small opening of the axial canal, and on the whole they seem to he entirely 

 comparable to those of K. pocillus. 



The orals are relatively large and form a five-lobed flat-topped crown 

 which rises abruptly above the radials. The outer portions of the sutures 

 which divide them lie in broad concave depressions and the outer portions 

 of the orals slightly overhang their junction with the radials below. 



The best preserved individuals of the K. astnts series are minutely pitted 

 and as they are very perfectly silicified there can be little doubt that this 

 represents the original spicular structure of the plates which were somewhat 

 porous. 



Occurrence. — These specimens were collected from a limestone near the 

 base of the Pennsylvania!! section near the center of the N. ^ sec. 35, 

 T. 21 N., R. 9 W., Warren County, Indiana. 



Kallimorphocrinus astrus intermkdius J. M. Weller. n. var. 



Plate I, figs. 3a-c 



This variety differs from the typical one in having its greatest width 

 approximately equal to its height. The basal stem facet is smaller, the basal 

 disc higher and the knob-like processes of the radials are much less developed 

 so that the horizontal outline is nearly pentagonal. 



Occurrence. — Same as the typical variety. 



Kallimorphocrinus astrus pyramidalis J. M. Weller, n. var. 



Plate I, figs. 4a-c 

 This form is furthest removed from the typical variety of the K. astrus 

 series. Each of the changes noted in the variety intermedins has progressed 

 still further. In this form the height is greater than the width, the basal disc 

 is higher, the stem facet smaller and the knobs on the upper part of the radials 

 only slightly developed. 



Occurrence. — Same as the typical variety. 



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

 Plate I, figs. 5a-b 



Description. — The height of the holotype is 1.02 mm. and is equaled by 

 the greatest width. The horizontal outline is star-shaped with slightly rounded 

 angles and concave sides. The radials form a little over two-thirds, the 

 basal disc one-ninth and the oral crown one-sixth of the total height of tin- 

 calyx. 



The basal disc is subpentagonal as viewed from below and has a diameter 

 equal to slightly more than one-fourth of the greatest width of the calyx. 

 The plain sides of the disc slope outward and upward from the stem facet 



