52 ROY L. MOODIE 
in size from the small Tuditanus minimus from the Cannelton slates 
of Pennsylvania, three or four inches in length, to forms like Diplo- 
caulus and possibly Macrerpeton which without much doubt reached 
a length of several feet. All the members of this suborder had well- 
developed cranial elements which are usually ornamented with radiat- 
ing grooves or with pits. The pectoral arch is well developed and is 
composed of dermal elements which are ornamented with sculpturing 
similar to that of the cranial bones. ‘The body of these animals was 
in a few cases covered with overlapping scales, but others appear to 
have had only the ventral surface armed and this was in some cases 
especially strong as in the genera Saurerpeton and Sauropleura. The 
vertebrae are uniformly of the phyllospondylous type. This is so 
generally the case that the condition of the vertebrae is taken as one 
of the chief characters of the group. Various peculiarities are seen 
among the Microsauria in the development of horn-like projections on 
the skull in genera which are in no way genetically related. The 
Microsauria continued on into the Permian in the family Diplo- 
caulidae. 
The genus Tuditanus is represented by several species in the Car- 
boniferous rocks of North America. Eight species are associated 
provisionally under this genus. Six of them were described by Cope 
from the Linton deposits of Ohio and two are described herewith 
from the Cannelton slates of Pennsylvania. A discussion of only 
three of the species will be given here since little of interest has been 
obtained from the study of the other species. The three forms here 
discussed are Tuditanus tabulatus Cope, T. minimus sp. nov., and 
T. sculptilis sp. nov. The facts which make the first-named species 
of interest here are the discovery of the lateral line canals on the skull 
and the correction of several errors in the original description as given 
by Cope. 
TUDITANUS TABULATUS Cope. 
(Figs. 8, 9) 
The species is known from a single well-preserved skull and its 
obverse in the collection of the Columbia University of New York 
City. I am indebted to Dr. Bashford Dean for the privilege of 
studying this interesting form. Itis from the Linton deposits of Ohio. 
