LARVIFORM CRIXOIDS 



27 



upper surfaces of the orals, are quite similar to those in the other species 

 here described. 



The surface of the basal disc and radials is beautifully ornamented by 

 thickly grouped, small, low or irregularly rounded pustules. 



Remarks. — This most striking species of Kallimorphocrinus can not be 

 confused with any other form as its shape and ornamentations are entirely 

 distinctive. 



Occurrence. — The holotype of this species was collected by Mr. J. B. 

 Knight from the limestone overlying the horizon of the Belleville (No. 6) 

 coal about 200 feet west of Louisville Avenue on West Park Avenue, Chelten- 

 ham district, St. Louis, Missouri. 



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

 Plate 1, figs. lOa-b 



Description.—: -The greatest width of the calyx considerably exceeds the 

 height which in the holotype is 1.04 mm. The radials constitute about ten- 

 thirteenths of the height and the basal disc and oral crown make up respec- 

 tively about one-thirteenth and two-thirteenths of the total height. The 

 horizontal outline of the calyx is stellate with bluntly rounded angles and 

 concave sides. 



The basal disc is pentagonal as viewed from below and its diameter is 

 equal to less than half the greatest width of the calyx. Its lower surface 

 is entirely occupied by a circular, slightly concave stem facet above which it 

 slopes upward and outward to the radials which rest in scallops cut in the 

 upper outer edge of the disc. 



The height of the radials is equal to somewhat less than twice their mean 

 width and they are a little more than one and a half times as wide above as 

 below. These plates are convex both longitudinally and transversely. The 

 transverse convexity is largely localized to form a median longitudinal, more 

 or less narrowly rounded angulation from which the plates slope off gently 

 to form the concave sides of the calyx. The longitudinal convexity is fairly 

 regular and the greatest width of the calyx occurs near the upper edges of 

 the radials. The upper outer corners of the radials are rounded off and 

 produce at their junction concave depressions into which the orals extend. 



The articular facets on the upper surfaces of the radials are not well 

 preserved but as far as may be observed they are comparable to those of the 

 other species of this genus. 



The oral crown rises abruptly above the radials but does not overhang 

 them. The details of this part of the calyx are somewhat obscure but the 

 oral plates are apparently similar in form and arrangement to those seen in 

 the better preserved specimens of other species. 



