paleontological geology 
263 
canus} Its nearest relative appears to be a form described by P. 
de Loriol, as B. africanus, from the Late Cretacic rocks of Tunis, 
which form is less robust, and has smaller cirri, and finer joint- 
face crenulations. 
Balanocrinus falls under the family Pentacrinidse, which is 
characterized by a stem development far exceeding that of any 
other crinoids, attaining in the typical genus, Pentacrinus, a length 
variously reported from five to twenty-one meters. These frag¬ 
ments are evidently remnants of stems of similar vigorous growth, 
as is indicated by the very large lateral cirri seen on some of 
them, and confirmed by the fact that one specimen, about twenty- 
five cm. long, is a part of a stem which was traced on the rock 
for a distance of about five meters. Balanocrinus is distinguished 
from the more widely known Pentacrinus by the sculpturing of 
the joint faces at the line of union of the columnals, which here 
takes the form of crenulations around the outer edge of the joint- 
face, and not along the sides of the petaloid sectors into which 
the central part of the face is divided. This character is thor¬ 
oughly well marked in these specimens, and by it the occurrence 
of the genus is proved for the first time in America. The ex¬ 
treme development of the stem, although to be expected, has not 
before been so well shown in this genus. As a record of the first 
known occurrence of the genus Balanocrinus in America, and of 
the fuller exhibition of the stem characters than has been hitherto 
available, it seems advisable to describe it as a new species. 
Frank Springer 
Late Paleozoic Fossils on Summit of Ozarks. Recent discov¬ 
eries by Mr. D. K. Greger of St. Louis, of Devonic and Carbonic 
fossils on the summit of the Ozark Uplift add a number of new 
localities to those already known, and clearly indicate that the 
doming of the region unquestionably took place subsequently to 
Paleozoic times, and that the Ozarks did not exist as an island in 
the broad epicontinental seas ever since Cambric times as is so 
often so persistently urged. 
Presence of these late Paleozoic rock remnants and fossils lons" 
o 
ago had critical bearing upon the age of the Ozark Dome, and 
its concompitant aspect of the myth of an Ozark Isle. The argu¬ 
ment for the latter had strong support from physiography, as 
1 (Proc. U. S. Nat. Mus., Vol. hXl, 1922.) 
V 
