OF ARTS AND SCIENCES. 25 



Arms. Twelve, composed of rather long, quadrangular pieces, rising 

 from the third radial piece and bifurcating on the second piece above 

 it. Only two ossicula above the bifurcation are preserved on our 

 specimen. The arms are slender. 



Vault. Our specimens do not show the vault. It is unknown. 



Column. Small, near the body, composed of thin pieces of equal 

 size and thickness ; the edges are rounded. 



Dimensions : — 



Height of calyx ...... .45 inch. 



Greatest diameter ...... .30 " 



Diameter at base of the arms .... .25 " 



Height of radials 22 " 



Geological position and locality. Rare, in beds at the top of the 

 sandy mud beds at the base of the subcarboniferous limestone, Clear 

 Creek, Hardin County, Kentucky ; Montgomery County, Indiana, &c. 



DiCHOCRINUS SCULPTUS, Sjp. Nov. 



Body. Short, conical, regularly expanding from the column to the 

 summit of the first radials ; the basals and first radials are elaborately 

 ornamented by prominent irregular carinte, which generally lie nearly 

 parallel to the vertical sides of the pieces. 



Basal pieces. Two; similar in form and size, pentagonal; dividing 

 line straight ; columnar facet large, prominent, expanded, producing a 

 rim around the column and the margin of the calyx. The joined 

 basal pieces have four curved and two angular depressions at the sum- 

 mit ; the deepest and largest of the latter marks the anal side. 



Primary radials : first series five ; subquadrangular, one third 

 higher than wide, inflated at the junction with the second radials, 

 which rise from a depression in their upper margin. The radials 

 of the second and third series (?) are absent ; their form is unknown. 



Anal piece. One ; similar in form and arrangement to the radials 

 of the first series. 



Arms. The form and number of arms are unknown. 



Column. Unknown. 



Dimensions : — 



IleTght of calyx ....... .27 inch. 



Diameter at summit of first radials .... .30 '' 



Diameter of inflation at the insertion of the column .10 " 



VOL. V. 4 



