A New Cystocrhwidedn Species. — Sardeso7i. 267 
plates, the other with the centres of the plates as centres, the 
two systems confusing. In each, the outermost or bovuiding 
ridge or row of warts is most conspicuous. The radial plates 
are least ornamented, scarcely at all so, in fact, above their 
mid-hight. 
No water vascular pores nor diplopores have been detected 
on the "patina" although closely searched for. Two pores 
which are easily seen in the lower angle of each infrabasal 
and which lead within the articular area of the column are 
very evidently not diplopores. But on the other hand, certain 
furrows on the outer surface of well preserved radials may be 
of the nature of "rhombs," although not accompanied by per- 
forations of the plates. As shown in figures i, 2 and 3, pi. 
xii, these structures extend between the bases of the arms. 
Weathering soon obliterates them as it has on the type speci- 
men. Carabocrinus appears to have similar structures, see fig. 
18, pi. xii. 
Returning now to the supposed posterior radials which do 
not bear large arms — their identification is based upon the 
existence of a truncated side and the nearly smooth surface 
next the same, and also upon the appropriate shape. They 
would not fit into the calyx except as placed. But most of all, 
they are identified by the existence of a notch, especially on the 
right posterior one, which has an interior raised periphery (fig. 
5, pi. xii), and with which is associated on the outer side one 
of the peculiar water vascular areas or rhombs (fig. 6. pi. xii). 
The left posterior radial is marked by a less distinct notch 
and rhomb, but has shown, pi. xii. fig. 8, by the three speci- 
mens a fracture-like mark on the otherwise smooth inner side. 
I do not understand its significance, merely having observed 
that it ends in the same direction as the marginal notch. The 
right posterior radial, its mate, bears a similar but less promi- 
nent scar, running a little differently at the lower end. 
The ventral side, very probably, was covered with smaller 
plates, whence the scalloped margins of the radials. The scal- 
lops are, however, not alike on duplicates of the same radial, 
and it must be believed, therefore, that the small ventral plates 
like the sutures were far from uniformly arranged. 
If the above interpretations be correct, this crinoid was in 
most essential features like the Cyathocrinidse, especially 
