230 Cineinnatt Society of Natural History. 
GAUROCRINUS SPLENDENS, Nl. SP. 
(Plate XI., Fig. 3, Magnified three diameters. Fig. 3a, another specimen magnified four 
and a half diameters. The letter a points to a division of the third secondary radial that 
may be a fracture of the plate or a natural division.) 
Column small, round, and composed of alternately thinner and 
thicker plates. Basals small, showing upon the outer surface a low 
triangular outline, slightly truncated laterally. Subradials large, 
hexagonal, longer than wide, and not truncated upon the upper face 
by an interradial. Surface mounted by a strong semi-cylindrical ridge 
which bifurcates in the upper part, and sends an arm to the adjoining 
first radials, and extends downward like a tubercle below the point of 
union between the column and basal plates. 
First primary radials about as large as the subradials, as long as 
wide, heptagonal. Second radials hexagonal, longer than wide. Third 
about the same size as the second, and not truncated by the axillary 
plate. Secondary radials three or four by ten, the arms not bifurcating 
at the top of the vault, but continuing, without bifurcation, to the 
‘twelfth or fourteenth plate. 
First interradial plate large, tuberculated, and followed by two 
smaller plates, and these by three, and so on to the top of the calyx, 
each bearing an elongated central tubercle. Intersecondary plates of 
the same character. 
.Pinnules directed straight from each side, showing that they do not 
cover the ambulacral furrows. 
The calyx is elongated and strongly pentagonal. The radial series 
stand out in bold cylindrical columns, while the interradial spaces are 
abruptly and deeply sunken, 
This beautiful species was collected in the Trenton Group, at. Cape 
Girardeau, Missouri, and is now in my collection. 
GAUROCRINUS MAGNIFICUS, 0. Sp. 
(Plate XI., Fig. 2, Natural size.) 
This is a robust species, readily distinguished from G. cognatus, by 
its prominent radial ridges. Column pentagonal, composed of thicker and 
thinner plates. Basals small, low, triangular on the outer face. Subra- 
dials longer than wide, ridge prominent. First and third primary radials 
of about equal size. Secondary radials four or. five by ten; a ridge 
arises from the second one, which passes over the intersecondaries 
toward the vault. No tertiary radials. Thearms bifurcate soon after 
becoming free, and four of them again bifurcate, so that the species 
