REPORT OF THE STATE PALEONTOLOGIST I903 283 



width of the RR ; the B of R posterior IR is heptagonal, the other 

 four are hexagonal. The plates of the anal row are pentagonal, the 

 anal x is about two thirds of the width of the RR on either side of 

 it, its vertical diameter is the same, one edge is uppermost and the 

 two vertical edges are nearly parallel ; the radianal is a little smaller 

 with one angle uppermost and its sides of very nearly the same 

 length ; the supplemental plate is slightly smaller still, of nearly the 

 shape of the anal x and with an angle down. The RR have raised 

 centers and the axial folds of these plates pass across the sutures and 

 over the neighboring plates after the manner of C. radiatus, 

 but the folds are finer and less prominent. The plates are very 

 faintly tuberculate, the tubercles showing rather more plainly along 

 the upper edges of the axial folds. The first Br is also the lAX, it 

 is pentagonal, stout, nearly or quite half the width of the R, and 

 well rounded on the back ; the hight of the outer edges is about one 

 fourth of the width of the plate. 



A very small portion of the tegmen is present in posterior IR; 

 the relative size and position of the plates will be seen in plate i, 

 figure 2. At each of the other four junctions of the RR in the 

 periphery of the tegmen there is a shallow excavation of the plate 

 margins, forming a straight base and an acute angle at either end 

 as if cut for a dovetail. This appearance suggests triangnlar del- 

 toids with a bordering plate on either edge, but as I am not familiar 

 with the tegmen of crinoids and do not have easy access to the litera- 

 ture of the subject I shall refrain from further suggestion. 



Attached superficially to the left edge of 1. posterior R there 

 appears to be an anal pyramid of five plates which may belong to 

 this species, and I have been careful to leave it on the specimen, 

 though as the locality abounds in crinoid fragments its mere prox- 

 imity should not be given undue weight. The apex of the pyramid 

 shows a very small starlike opening, each plate having a more or 

 less pointed tip and failing to meet its neighboring plates near the 

 apex. 



Three rings of the stem are still attached to the cup and seem to 

 be rather uniform in size, about four to the millimeter and imm in 

 diameter. 



