68 
Kirtley F. Mather 
ous genera. Zaphrentis gibsoni is probably the only species of 
that genus which is recorded from the Pennsylvanian strata 
although the genus is quite abundant in the Mississippian rocks. 
It is known to occur in the Coal Measures of Indiana and the 
Pennsylvanian limestone of Colorado. The genus Amplexm, 
represented in the Morrow fauna by a new species, is rarely 
present in North America above the Mississippian beds as it 
has heretofore been reported only from scanty fragments in 
the Hermosa and Weber limestone of Colorado, the Lower Aubrey 
of Utah, and from the Guadalupian terranes. Lop hop fiy Hum 
profundum and Campophyllum torquium are widespread 
throughout the Coal Measures of the Mississippi valley and both 
occur in the Pennsylvanian limestones of the west. The latter 
genus is not reported from the Mississippian formations of 
North America but the former is present in the Keokuk and 
Chester beds. Both species have a long range above the Mor- 
row, the former persisting to the uppermost of the Pennsylvanian 
formations of Kansas and the latter disappearing only above 
Stage G of that section, as reported by Beede and Rogers.-^ 
The favositid tabulate corals include a new species of Pachy- 
pora and three species of Michelinia, only one of which was 
heretofore known. Pachypora is abundant in Silurian and 
Devonian formations but has not been heretofore reported from 
the later Paleozoic rocks of North America. It occurs, how- 
ever, in the Productus limestone of the Salt Range and probably 
elsewhere in Europe and Asia. The genus is also represented 
in the Fayetteville shale of Oklahoma by a single species, quite 
distinct from that found in the Morrow.-- Michelinia eugeneae 
is present in the Coal Measures of Indiana, Illinois, and Kansas 
and in the last named state is restricted to the two lower series 
of the four into which the Pennsylvanian rocks are divided. 
The genus is recorded as occurring frequently in the Missis- 
sippian strata. 
Associated with these forms are three other tabulate corals, 
Aulopora sp., Cladochonus fragilis, and Chaetetes milleporaceons. 
The first named genus is quite common throughout the Carbon- 
iferous rocks of North America but the second is represented 
by only two species besides the one here described. One of these 
occurs in the Fern Glen formation while the other is found in 
