\ 
340 WHITE—OMPHALOPHLOIOS, A NEW LEPIDODENDROID TYPE. . 
seem to have a cortex marked by prominently bossed Lepidodendroid 
bolsters, in the axils of whose leaves was situated either some organ or 
appendage attached to the oval boss, or else, as appears more probable, 
an oval plaque in the depression of which was a minute umbilicate trace. 
In accordance with such an hypothesis the punctiform trace at the upper 
margin of the leaf scar might be homologized with the “ ligular” trace 
or pit of the typical Lepidodendron, while the umbilicate trace within 
the oval boss may be analogous to if not homologous with the so-called 
‘““sporophyll” in those stems. 
Whatever the interpretation offered, the superficial characters of these 
stems seem to be quite different from those of any of the existing Lyco- 
podineous genera. Consequently I propose for those trees with this type 
of embossed cortex the generic name Omphalophloios, though a diagnosis 
of the genus* of which O. cyclostigma is the type is postponed until the 
relations between the oval boss and the leaf cicatrix are more clearly 
demonstrated. ; 
A specimen which I regard as representing a decorticated or Knorria 
state of this type strongly resembles the Knorria of Bothrodendron, to 
which genus ours is perhaps most closely allied. 
Localities—The originals described by Lesquereux are numbers5501 and 
5902 of the Lacoe collection, United States National Museum, *‘ Clinton, 
Henry county, Missouri.” Later accessions are from Pitcher’s coal mine, 
lot 407, Museum register 5636, and lot 340. Deepwater, lot 408, Henry 
county, Missouri. The Knorria fragment is from Gilkerson’s Ford, in the 
same county. 
*°Oudadros, the boss of a shield, ++ ®dAotos, bark. 
