ele 
Wachsmuth and Springer—Paleocrinoidea. 369 
extend beyond the upper edge. There is seen, however, in one 
of our specimens at that side a small share with possibly 
an opening, which may represent the anal aperture. e 
and its genera appearance that of the rhombs in the Cystidea. 
Indeed the resemblance to the latter is so striking that we 
think the grooves of Hybocrinus communicated, like those of 
the rhombs, with the inner body. 
hollow portion of the anal piece to be solid, for he took the 
of the plate, and heavy-plated, when in fact it is delicate and 
hollow within. Thus only can we explain his supposition 
that the azygous plate was supported by a strong ventral sac. 
He evidently thought the so-called “articulating surface” had 
line of junction by suture. The word “ articulation” has be 
frequently used in the description of Crinoids in the latter 
Sense, and we have ourselves used it so; but it is not a good 
practice, and should be abandoned. A connection by suture 
ought to be called so, and the above term be used only when 
there is a movable connection or true articulation. 
