16 
The codssified pelvic elements resemble, in their compression below, the 
corresponding parts in the Anura. The ilia are, however, shorter and 
worn as in the Urodela. They are flat, and stand at right angles to the 
line of the ischiopubic symphysis. There is an open concavity of their 
inferior posterior free border, and a facet-bearing elevation on the inferior 
border, or that entering into the formation of the acetabulum. The latter 
is large and half as long azain as deep. The anterior and posterior borders 
of the pelvis descend regularly to the inferior edge, forming with it a trian- 
gle. The ischiadic or posterior border is but little thickened ; the anterior, 
or pubic is flat in front and presents a reverted edge outwards. This ex- 
pands prominently where it-is joined by a ridge which bounds the acetabu- 
lum below; it there contracts to an inferior apex. Beneath the anterior 
point of the acetabulum it is pierced by the usual foramen, which issues on 
the inner edge of the anterior face, just above the symphysis. 
The humeral bones of this genus I probably possess ; but I have several 
forms between which I am not able to decide. They are in general like 
those of the Pelycosauria, but differ from them in not having an enclosed 
supracondylar arterial foramen, but only the buttresses of its enclosing 
arch. Two such forms I have already deseribed,* and a third has been 
obtained from the French Permian by Professor Gaudry. One quite 
similar to the latter I have since obtained from Texas. Not having been 
able at first to determine the proper reference of these humeri, I suggested 
to Prof. Gaudry that his humerus belongs to one of the Pelycosauria, and 
he accordingly described it as Huchirosaurus rochei.t I now think that 
there is greater reason for believing that it belongs to a species of the same 
group as Hryops and Actinodon. 
In all these -humeri the extremities are expanded in different planes, and 
the shaft contracted. The articular surface of the proximal extremity is 
band like and passes obliquely from one side to the other as in the Pelyco- 
sauria. The condyles are large, consisting ofa globular portion and a de- 
pressed trochlea without ridges at one side of it. 
The femora are very different from the humeri, but in much the same 
way as in the corresponding bones of existing Batruchia. There are 
no condyles at either extremity, but outlines of such, enclosing roughened | 
surfaces. These look as though the bases of attachment of cartilaginous 
caps or epiphyses. The proximal extremity is convex, and is extended in 
one direction. One border, the anterior, is regularly gently convex; the 
opposite arc is strongly convex near one end only. The articular face is 
in two planes, one larger than the other. The trochanteric fossa is at first 
shallow, end occupies the entire widih of the bone, it narrows with the 
shaft downwards and the borders rise, one more than the other. The two 
join in a strong protuberance, which looks directly backwards, and may be 
called for the present the third trochanter. The shaft is keeled below and 
in continuation of the trochanter, to where it expands for the distal articu- 
* Paleontol. Bulletin, 29, 1878, p. 529. 
+ Bulletin Soe. Geol. France, Dec , 1878. 
