348 KANSAS UNIVERSITY SCIENCE BULLETIN. 
the other. Parts of the plants have been converted into and 
destroyed by galena and kaolin, as have also parts of the bones, 
so that the task has been doubly difficult. There can be no 
doubt, however, that the observations recorded below are 
correct. The position of the arm in relation to the pectoral 
girdle and the position of the girdle in relation to the skull 
impression first called attention to the possible presence of a 
fossil amphibian. 
There is little to be said of the skull. It is merely an 
impression in the nodule. It is triangular in form with the 
snout an acute angle. The angle is, however, exaggerated 
by the compression to which the fossil has been subjected. 
The right side of the skull lies over a portion of some plant. 
The animal is preserved on its back, so that this gives a good 
opportunity for the study of the pectoral girdle, which is 
partially preserved. The interclavicle is very large, and from 
that character the species has been given its name (thoracatus 
—armed with a breast plate). The interclavicle is an ex- 
aggerated “T’’ with the stem very short. Its anterior margin 
is curved and ends is a rather sharp, elongate point. The 
posterior spine is quite short and sharp-pointed, having a 
length of four millimeters. The interclavicle recalls, in a 
measure, the same element of Branchiosawrus, although it is 
much more expanded anteriorly and has a shorter spine. In 
these respects it resembles more nearly a reptilian element. 
The bone is quite smooth. 
The clavicle is of the simple triangular form so character- 
istic of the Microsauria. It is somewhat displaced backward 
and its inner margin is slightly obscured. 
The humerus is elongate, apparently cylindrical, and has 
expanded ends. It resembles closely the humerus of Amphib- 
amus grandiceps, although its proportions are much greater 
than in that species. Its length is almost equal to the length 
of the skull, while in A. grandiceps the length of the humerus 
is only one-half that of the skull. 
The radius (ulna ?) resembles in its general proportions 
those of the humerus. It is a more slender, lighter bone. The 
impression of the other bone of the fore arm is obscured. 
A portion of a single vertebral centrum is preserved. It 
is from the posterior part of the dorsal series. The centrum 
is apparently amphiccelous. Its height is about one-half 
greater than its length. The neural spine is obscured. 
