BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 
VOL. 9, PP. 329-342, PLS. 20-23 MAY 24, 1898 
OMPHALOPHLOIOS, A NEW LEPIDODENDROID TYPE* 
BY DAVID WHITE 
(Read before the Society December 29, 1897) 
CONTENTS 
Page 
TMOG GELOM eres eh eieyec halo Ne als ances vsivis Liaise = eglsiercsiss SEC R USO Ome Cee oe 329 
Detailed description of originals of Lepidodendron cyclostigma Lx............- 330 
Description of additional specimens, ............ 2.2... cece eee eee eee eee 332 
Diagnosis of Omphalophloios cyclostiqgma............6. cc cece eee ee cae 336 
ImenpuetationkoitheNpants qecee wc cise sls ace vee cae ase ac oa eases sleeeiee op eis 337 
INTRODUCTION 
Among the extensive collections from the Des Moines series, or Lower 
Coal Measures, of Missouri, sent during the last few years to the United 
States National Museum or the United States Geological Survey,t is a 
series of specimens which throw much interesting light on the unique 
and somewhat problematic species described by Professor Lesquereux as 
Lepidodendron cyclostigna.t 
Pitcher’s coal mine, in Henry county, the source of most of the new 
material, seems, as indicated both by the associated species and by the 
matrix, to have been the source of the types of the original species, now 
numbers 5501 and 5502 of the Lacoe collection in the National Museum. 
In any event it is certain, as is shown by the records and labels, that the 
fossils described by Lesquereux came from the same vicinity. The spe- 
cies has not been found elsewhere. 
Since the recently acquired material includes examples exhibiting 
many new characters and features, whose interpretation is subject to 
differences of opinion, as well as a remarkable variation in the forms of 
* Published by permission of the Director of the U. S. Geological Survey. 
+ Collections forwarded by Dr J. H. Britts, Clinton, Mo.; by the U.S. Geological Survey, through 
Dr W. P. Jenney, now of Deadwood, S. Dak., and Mr Gilbert Van Ingen, now curator of the Geolog- 
ical Museum, Columbia University, New York. 
{ Coal Flora, ii, 1880, p. 394, pl. Lxii, fig. 5. 
XLIX—Burr. Gron. Soc. Am., Von. 9, 1897 (329) 
