Descriptions of New Siyecies of Crinoids. 139 



Subradials — Five, foiu- pentagonal, the one on the azygos side hex- 

 agonal, and somewhat larger than the others. All are about as wide 

 as higli, with the upper extremit}^ pointed, and completel}^ embraced 

 b}^ the first radials, except the one on the az\'gos side, which is trun- 

 cated, and supports the first azygos plate. 



Radials — In one specimen, four to each ra}^ or twenty in all, while 

 in other specimens two of the rays have four each, the others having, 

 three. The first plates of the i-adial series are distinctly pentagonal, 

 somewhat higher than wide, and alternate with the sub-radials, a line 

 passing through their center being continuous with the sutures uniting 

 the latter. The second and third plates of this series vary somewhat 

 in form, owing to their articulation to the inter-radial and azygos 

 plates, but are either hexagonal or irregularly quadrangular, those of 

 the two ra3^s bounding the azygos side varying somewhat from the 

 others. The fourth radials (or third in rays having but three radials) 

 are axillary, distinctly- pentagonal in each ra}^ of every specimen, 

 wider than high, and are the most regular in form and size of any 

 plates in the radial series. 



Upon these radials the first bifurcation takes place, the first bra- 

 chial plates resting upon their outer, sloping, upper sides. 



Of the brachial plates, before the second bifurcation, there are two 

 in each ray of every specimen, the fii'St or lower of which is quadrangu- 

 lar, higher than wide, and all are remarkably uniform in shape and 

 size. The second brachial is, in all cases, pentagonal, and upon its 

 sloping upper sides, rest the first plates of the series resulting from the 

 second bifurcation which takes place on them. Above this division 

 the arm plates are continued in series of threes, two of which are ir- 

 regularh' quadrangular, and much longer than wide, while the third is 

 pentagonal, and gives rise to the third and last bifurcation. 



Inter-radials — Five to seven in each space, hexagonal and pen- 

 tagonal in form, the lower one hexagonal and resting with its pointed 

 lower extremity in a line with the suture of the contiguous first radials. 



Azygos pieces — Five to seven, the lower one resting upon the truncat- 

 ed upper extremity of the sub-radial on that side. 



No inter-axillary pieces are to be found in any of the specimens 

 which are in a very fine state of preservation, showing the features set 

 forth in the most satisfactory manner. 



As will be seen from the description, the number of arms after the 

 third division is forty. The final extremities of these are so folded 

 iver the ventral side of the specimens as to completel}' hide the vault, 

 if any, as likewise the pinnulffi. Several of the rays show evidences 



