TWO NEW CRINOIDS FROM THE KANSAS CARBONIFEROUS. 



Contribution from the Paleontological Laboratory No 53. 



BY J. W. BEEDE. 



With Plate V. 



Seajjhiocj'iiius ? washburni, n. sp. Plate V, figs. 2, 2a. 



/^1ALYX broadly obconical, somewhat wider than high, rather stout, 

 ^^ and smooth. Infrabasals rather large, bent upward at outer end, 

 exterior outline pentagonal, plainly visible in the side view of the 

 calyx, well defined. Column large, circular, composed of alter- 

 nately thick and thin pieces, the outer half of the sutures radially 

 milled, the median canal of moderate size. Basals large, three hex- 

 agonal, and the posterior and right posterior ones heptagonal for the 

 reception of the anals ; the plates are nearly all equal, and the sutures 

 are placed in a shallow, rounded fur-row, which in branching at the 

 angles of the plates gives them a rounded appearance, so that the 

 plates appear subsemicircular in outline. The radials are the lar- 

 gest plates of the calyx, all pentagonal, all about equal, save the right 

 posterior, which is smaller than the rest ; the entire surface trun- 

 cated above, edge slightly beveled, wider than high, entire upper 

 surface faceted ; the transverse ridge is milled, the lateral corners of 

 the plates drawn in, apparently leaving a pore which connected with 

 the body cavity of the calyx ; there is a dorsal canal piercing the up- 

 per surface of the plates ; the inner edges of the plates are drawn in at 

 the center and extend in the form of a ridge to the canal. Costals 

 1 X 5, about half the size of the radials, pentagonal, line of articulation 

 with the radial gaping, lateral edges constricted and apparently not in 

 contact, about twice as wide as high. The first interradial is large 

 and situated well down in the cup. supported by the posterior basal 

 and the one at its right, on the sides by the special anal and the right 

 posterior radial, and supports another anal above it on its truncated 

 top. The special anal is moderately large and hexagonal, bounded on 

 the right by the two interradials, below by the truncated upper surface 

 of the posterior basal, on the left by the left posterior radial and the 

 space between it and the costal; it is about half within the calyx. 

 Above the first interradial is a second, somewhat smaller, pentagonal 

 plate which is about, or a little less than, half within the calyx. This 



[21]-K.U.Qr.-A ix 1-Jan. '00. 



