10 



arms bifurcate at a slightly divergent angle; they bifurcate 

 again after the third or fourth, and again after that at from the 

 seventh to tenth joint; terminations attenuate. 



Column composed of various sized joints, which have a ten- 

 dency to an alternate arrangement of long and short joints ; 

 they are barely narrowed at their juncture, which is strongly 

 dentate. 



Root palmate, unjointed. 



Growing on a Fenestella. 



LECANOCRINUS INCISUS (N. Sp.). PI. I, fig. 6. 



Calyx cup-shaped, rapidly expanding; sharply notched on the 

 upper margin at the junctures of the first radials; base with a 

 slight depression to receive column. Arms rounded externally, 

 scarcely tapering except by bifurcation. 



Column slender, nodose, slightly tapering downwards in the 

 upper third. 



Basal plates flexed downwards and then upwards, forming a 

 depression for the column; sub-radials about as wide as high, 

 the three on the anterior side being pentagonal and nearly equi- 

 lateral; intercalated plate small, irregularly quadrilateral; radials 

 large; height to width about four to five; lateral upper angles, — 

 except the left upper angle of the one to the right of the anal 

 plates, — truncate and slightly incurved, forming small V-shaped 

 notches in the rim of the cup-like calyx; anal notch formed 

 between the interradial plate and the adjoining radial to the 

 left; after the first there is a second and often a third free radial, 

 the last of which has a well defined dentate projection in the 

 center, which is about as high again as the plate at the outer 

 margin; these are wide and low, about one to four or five, and 

 are as wide at the base as the distance between the notches in 

 the first radial series. Arms bifurcate again after the fifth or 

 sixth joint, and in one arm eight more joints can be counted 

 without further subdivision. Column composed of joints with 

 a projecting, rounded, ring-like annulation that is about two- 

 thirds as high as the length of the joint in the upper part; these 



