REPORT OF THE STATE PALEONTOLOGIST I9O3 279 



over the brachials at about one fourth the width of the plates from 

 their margins, as fine, raised ridges ; these fork near the upper edge 

 of IBr (first primibrach), and again just as they leave the lAx; the 

 outer branch in each case remains the stronger but becomes very 

 faint on IIBri. The first secundibrach (IIBri) is about twice as wide 

 as high and the pentagonal lAx presents approximately the same 

 area of surface. These plates seem to be ornamented only by what 

 appear to be faint nerve ridges and their branches which present 

 some very faint reticulations. No ray seems to have possessed a 

 plate between IBr^ and TAx. Each interradius has one large plate 

 in contact with the basal s, and six or seven plates in addition, one 

 of which may be as large or slightly larger than the first; directly 

 over these the pinnules from IIBr^, with 

 their plates somewhat enlarged, meet each .^^^^^^^^^^ 



other and are incorporated in the cup. The ^ ^ 



10 arms, thus brought closely together, are 

 comparatively large, biserial and, with their ^| 



pinnules, obovate in outline; the IIBr 

 counted on one side number 35 and over 



, , 11111 P"i&- 5 Diagrammatic cross- 



and are strong and rounded on the back; section of Lyriocrinus? 



beecheri showing tiie man- 



the pinnules are closely set and the longest overXi'te^melf'^"'^ ^"^^ ^""^^'^ 

 measure about 5mm ; the whole arm is very 



plumelike in appearance and the manner of folding over the cup 

 extremely graceful. This folding is a mixture of the convolute and 

 imbricate and is shown in figure 5. 



Observations. The crushed condition of the cup has made the 

 determination of the arrangement of the plates of the interradii a 

 somewhat difficult matter. In my drawing of this plate arrangement 

 (fig. 4), I have outlined only such plates as were present and in, 

 or nearly in, their normal position. In one or two instances a frac- 

 ture may have been taken for a suture. The complete interradius 

 to the right in the cut was drawn from plates crushed in just below 

 the first incorporated pinnules and perhaps should have one or two 

 additional small plates near the latter. The completed interradius 

 placed in the position of 1. anterior IR apparently has had its basal, 

 the top of which is broken across, forced to one side. This inter- 



