454 THE DEPTHS OF THE SEA. [cHAP. 1X. 
that the syzygies are not repeated, so that there is 
only one of these peculiar junctions in each arm. 
The arm-grooves are bordered by circular fenes- 
trated plates, as in L?hizocrinus. 
Certain marked resemblances in the structure of 
the stem, in the structure of the base of the cup, 
and in the form and arrangement of the ultimate 
parts of the arms, evidently associate Bathycrinus 
with Rhizocrinus, but the differences are very wide. 
Five free keeled and sculptured first radials replace 
the uniform smooth ring formed by these plates 
in Rhizocrinus. The radial axillaries give off each 
two arms, thus recurring to the more usual arrange- 
ment in the order, and the alternate syzygies on 
the arms, which form so remarkable a character in 
Rhizocrinus, are absent. 
Only one nearly complete specimen and a de- 
tached stem of this very remarkable species were 
met with, and they were both brought up from the 
very greatest depth which has as yet been reached 
with the dredge, 2,485 fathoms, at the mouth of 
the Bay of Biscay, 200 miles south of Cape Clear. 
It would seem, in our present state of knowledge, 
that the stalked crinoids are members of the deep- 
sea fauna. A second specimen of another very 
remarkable form, Holopus rangi, D’OrBieNy, has 
lately been procured from deep water off Barbadoes, 
and that species, with those already noted, makes 
up the tale of living forms belonging to the order 
which are known at the present time. It is unwise 
to prophesy; but when we consider that the first 
few scrapes of the dredge at great depths have 
added two remarkable new species to the living 
