74 Cincinnati Society of N atural History. 
the square column, but it was not found until during the past year, 
and now we have not only two species, but they belong to distinet 
genera. , 
GLYPTOCRINUS HARRISI, 0. Sp. 
Plate I., fig. 4, azygous side, natural sizes fig. 4a, same, magnified two diameters. 
General form of the body, obconoidal, with slightly depressed inter- 
radial and axillary areas, as in G. decadactylus. I have not been able 
to determine with certainty, whether this species has four or five basal 
_ plates, but as in all other respects it agrees with Glyptocrinus, I sup- | 
pose it possesses five, each of which is wider than high. If, however, 
it possesses only four, it would not belong to Xenocrinus, above 
established, but would still be very closely allied to Glyptocrinus. 
‘There are three primary radials in each series. ‘These plates are 
heptagonal or hexagonal, and of about equal size, as in G. decadactylus. 
The third primary radial supports upon its upper sloping sides, the , 
secondary radials of which there are two in each series, as in G. de- 
cadactylus. From the second of these there arises the two series of 
brachial plates. the first seven or eight of which are incorporated into 
and form part of the body. Here the species may be easily dis- 
tinguished from G. decadactylus, for, in the latter, only one or two 
plates are incorporated into the body. The increased number of bra- 
chial plates in the body, at this place, makes it very much longer, 
proportionally, than G. decadactylus. | 
There are twenty free arms at the vault, but whether they hifurcate 
above this or not has not been determined. ‘The interradial series con- 
sists of one plate in the first range, and two in the second, as in G. 
decadactylus ; but above this there are many more plates, owing to 
the increased length of the body, than there are in the latter species. 
The azygous area is distinguished from that of G. decadactylus, by. 
_ the increased extension. The axillary areas contain twenty or thirty 
small plates having a central tubercle on each; and the interbrachial 
areas have not less than ten or fifteen similar plates in each area. 
The surface is sculptured, in the lower part of the body, so as to form — 
triangular depressions between the six star-like radiations from the 
central part of the plates, as in G. decadactylus; but, above the 
primary radials, the plates are simply tubercled, and above the second- 
ary radials not more than a single tubercle occurs on each plate. 
The column is square, and it is highly probable that the square 
crinoid column, that I described iu the Cincinnati Quarterly Journal 
of Science, in 1875, belongs to this species. 
