94 THE PALEONTOLOGY OF MINNESOTA. 
[Protarea. 
Section MADREPORARIA PERFORATA. 
Family PORITIDAS. 
Prorar@a vetusta Hall, sp. 
PLATE G, FIGS. 24, 25. 
1847. Porites? vetusta HALL. Paleontology of New York, vol. i, p. 71, pl. 25, fig. 5a, 5b. 
1850. <Astreopora vetusta @ORBIGNY. Prodrome de Paleontologie. 
1851. Protarea vetusta EDWARDS and HAimE. Monograph Poly. Foss. des Terr. Pal., pl. 14, fig. 6. 
1875, Protarea vetusta NICHOLSON. Paleontology of Ohio, vol. ii, p, 221. 
1875. Protarea vetusta NICHOLSON. Paleontology of the Province of Ontario, p. 9. 
1882. Protarea vetusta HALL. Eleventh Rep. State Geologist of Indiana, p. 378, pl. 49, fig. 4. 
Original description._—“ A sub-hemispheric coral, composed of irregular concentric 
lamine ; cells vertical to the lamin ; openings upon the surface, nearly circular, 
with internal vertical lamellee which reach half way to the center.” 
The following description is that of Nicholson (Pal. Ohio, vol, ii, p. 221): 
“Corallum forming thin crusts, about one-third of a line in thickness, which 
grow parasitically upon foreign bodies. Calices nearly equally developed, usually 
hexagonal, about one line in diameter or rather less, shallow, the bottom of the cup 
being tuberculated. Septa twelve in number, sub-equal, extending but a short dis- 
tance inwards towards the center of the visceral chamber. Walls of the calices thick.” 
Mr. Ulrich has a specimen of this species from the upper layers of the Trenton 
shales of “St. Anthony hill,” St. Paul, Minnesota. He writes us that the specimens 
from the Cincinnati group and identified with this species have larger calices than 
those collected by him from the Trenton at Pauquette Rapids, Canada, which are, 
undoubtedly, like the specimen from Minnesota. If this difference is a specific one, 
which is very probable, then the specimens from the Hudson River group and 
referred to this species should be distinguished by another name. It may be that 
this is the form named in 1851 by Edwards and Haime, Protarea verneuili (Pol. Foss. 
des Terr. Pal., p. 71.) 
Formation and locality.—A single specimen of this species has been found in the Hudson River 
group at Spring Valley, Minnesota, upon a fragment of a species of Rafinesquina. It is also found in the 
upper portion of this group at Richmond, Indiana; Oxford, Waynesville, etc., Ohio, and Wilmington, 
linois. Inthe lower portion of the Trenton formation at Waterfown, New York; Peterboro and near 
Ottawa, Canada, and St. Paul, Minnesota. 
Mus. Reg. No. 7725. 
