414 PALAEONTOLOGY OF ILLINOIS. 



SCAPHIOCRINUS PENICILLUS, M. and W. 



PL 2, Fig. 7. 

 Scaphiocrinus penicillus, MEEK and WOHTHEN. Proceed. Ao.ad. Nat. Sci., Phila., 1869, p. 142. 



BODY small, somewhat basin-shaped, or about three 

 times as wide as the hight to the top of the first radial 

 pieces, truncated, and a little concave below. Base very 

 small, and nearly or quite hidden by the column in the 

 shallow concavity of the under side. Subradials generally 

 wider than long, with a pentagonal outline, excepting one 

 on the anal side, which has the upper angle a little trun- 

 cated, so as to make a sixth angle ; there is doubtless also 

 another obtuse angle at the middle of the lower side of 

 each, covered by the column. First radial pieces wider 

 than high, and pentagonal in form. Second radial pieces 

 nearly twice as long as wide, expanded at each end, and 

 distinctly constricted along the middle, where they are each 

 somewhat carinated on the dorsal side; all pentagonal in 

 form and supporting each two arms on their superior slop- 

 ing sides, excepting in the anterior ray, where this piece is 

 quadrangular and supports but one arm. 



Eirst anal piece wedged obliquely down in between two 

 of the subradials, under one side of the first radial, on its 

 right, and connecting by its left side, above the middle, 

 with another anal resting on a very short truncated side of 

 one of the subradials, and connecting on the left with the 

 first radial of that side. Above these one or two other 

 pieces are seen between the arms, connecting with the base 

 of the proboscis. 



Arms somewhat rounded, and bifurcating on the fifth or 

 sixth piece above the second radials; and in all but the 

 anterior ray, one of the divisions (the inner one) remains 

 simple, and the other subdivides again on the sixth, seventh 

 or eighth piece, -while the anterior arm bifurcates first on 

 the sixth piece, and each of its subdivisions again on the 



