Description of Some New and Remarkable Crinoids. 71 
ee of fifty, or whether the ten channels were reduced to five before they 
united at the center, as seems quite probable, we are unable to deter- 
mine. The whole disc within the ring was covered with plates 
that seem to have imbricated toward the center, and the condition of | 
the preservation of our specimen is such that the series of radiating 
channels appear to have inosculated, but whether this appearance has 
resulted from the erosion of part of the imbricating plates, or really 
_ represents the true character of the radiating circulation of the animal, 
is not fully determined. : 
It would seem probable, from what we know of this species, that it 
consisted of a central disc, which was covered by numerous small plates 
and surrounded by a rim composed of twenty-plates, which bore upon 
its outer surface another rim or border having as many or more scars, 
or mammillary elevations upon it, as there were circulating channels 
connecting it with the disc. That from the central part of the disc, 
there arose either five or ten radiating channels, which bifurcated and 
possibly inosculated and pierced the rim in fifty places. That the cir- 
culation passed through the rim into the outer border. That the scars 
upon the outer border represent the cicatrices of ossicula. That there 
was a circular circulation through the rim, and as the rim is tuber- 
culous, there may have been a porous connection with the outer world 
through it. 
The specimen illustrated is from the collection of {. H. Harris, Esq., 
of Waynesville, Ohio, and was found in the upper part of the Hudson 
River Group, in that locality. 
a 
XENOCRINUS, N. gen. 
[Ety.—Xenos, strange, new; krinon, a lily.] 
Body, proportionally, rather long and gently expanding, so that its 
diameter, at the free arms, is only one half or two thirds of its length. 
Basals, four; no subradials; primary radials three; secondary radials 
four, five, six, or more, which enter into and form part of the cup or 
body; interradial and inter-secondary radial areas deeply excavated 
and filled by numerous small plates; azygous interradial area contain- 
ing a vertical: series of plates, to the top of the body, of about the 
same size as the radial plates, which rest upon a basal plate and 
occupy the central part of the azygous area, and between which and 
the primary and secondary radials, on either side, there is an excavated 
area filled by numerous small plates, as in the four regular interradial 
areas. ‘The vertical series, however, continues to the top of the pro- 
boscis, which is prolonged to or beyond the extension of the arms. 
‘\ 
