268 The American Geologist. November, i«9ii 
Carabocrinus. But there is a greater number of azygous or 
anal plates than in those, and the same are large. Five radiat- 
ing ambulacral furrows were evidently developed, and of these 
the anterior one certainly ended in a well developed arm. 
which, however, articulates to a comparatively small area near 
the centre of the radial plate. The right and left anterior fur- 
rows evidently united with arms and radial plates like the 
anterior one. The right and left posterior radials, as recon- 
structed, have the ambulacral furrows scarcely encoaching 
upon their margin. By close search, it has been found that 
a slight indication of a small articular area is sometimes pre- 
served on these, and it is believed therefore that the posterior 
ambulacral furrows ended in small free arms, which, how- 
ever, were based in part only, when at all, upon the radial 
plates. There are, thus interpreted, five arms, three anterior 
large crinoidean ones and two posterior smaller cystocrinoid- 
ean ones. Conservatively, however, it must be said that we 
have proof of but one arm. and partial proof of the others. 
The stem was slender, as shown by a small piece which is 
preserved on the type specimen. Where this piece is broken 
ofT, one can see that it is evidently composed of five columnals 
in each segment. It united to a distinctly impressed articular 
area on the calyx, which appears also on isolated infrabasal 
plates, fig. 10, pi. xii, the shape of this area and of the acute 
lower angle of the infrabasals, indicating, moreover, that the 
communication between the hollow of the stem and the interior 
of the calyx was through the pores or perforations, of which 
there is one pair on each infrabasal. The double-sized infra- 
basal bears two pores belonging to one-half and a wart or 
fascet, not perforated, on the other half nearer the margin 
of the articular scar. In fact, the angles of the two supposed 
anchylosed plates here do not coincide, the left half of the 
plate, bearing the wart, has the position of the lower angle 
pushed back or away from the stem's centre. On fig. ii, pi. 
xii, the angle of the right half is broken away and the pores 
lie on the fractured edge. 
An associated disc-shaped root or stump is probably the 
base of this species' stalk. On the dark stained limestone 
pebbles before mentioned occur not rarely circular blacker 
areas, fig. 17, pi. xii, with radiating ridges and a central spot. 
