Description of New Species of Fossils. 261 
to distinguish it. The difficulty in distinguishing a Bridgeport 
cast from a Waldron specimen covered with plates, does not exist 
when we have a Bridgeport specimen with the plates preserved to 
compare with the Waldron specimen. 
The three specimens illustrated are from the collection of W. C. 
Egan, Esq., of Chicago, Illinois. He has another specimen with the 
plates on top of the vault, and those on one side preserved as far down 
as the top of the third primary radial. 
CYATHOCRINUS VANHORNEI, D. sp. 
(Plate VI., fig. 3, view of the left side, also showing the azygous plate—natural size. 
The lower part of the basal plates on the posterior side have been broken off.) 
Body strongly constricted at the middle of the sub-radials, and 
ereatly expanded above on the azygous side. Basals as long, as wide, 
and the expansion of the cup commencing in the middle part. Sub- 
radials large, a little longer than wide, hexagonal and pentagonal, and 
strongly constricted as above remarked. Radials wider than high, and 
broadly notched for the reception of the arm plates. There is a single 
large azygous plate resting upon the upper face ofa subradial. The 
arms are evidently strong, though not preserved in our specimens. 
Column, unknown. The entire surface of the plates is smooth. 
The smooth, round, constricted form of the body will distinguish 
this species from any other. The casts may also be distinguished 
by the constricted and elongated form. 
The specimen is named in honor of W. C. Vanhorne, general super- 
intendent of the Chicago, Milwaukee and St. Paul R. R., a gentleman 
who finds time to superintend more than 4,000 miles of railroad, and 
to study the resources, and the geology and paleontology of the whole 
country traversed by the roads. The specimen illustrated is from the 
Niagara Group, at Bridgeport, Illinois, and belongs to his fine private 
collection, at Milwaukee, Wisconsin. 
GLYPTASTER EGANI, N. sp. 
} 
f 
4 
(Plate VI., fig. 4, side view, natural size; fig. 4a, same view magnified; fig. 40, basal view.) 
Body of medium size, obpyramidal. Basals small and nearly or 
quite covered by the column. Subradials well developed, highly con- 
vex or protuberant with an inclined face directed toward each suture, 
thus presenting an hexagonal cutting. The first radials almost regu- 
larly hexagonal, and the largest plates of the body; most highly con- 
