456 H. G. SEELEY ON A MAMMALIAN FEMUR AND 
35. Notre on a Femur and a Humervs of a smart Maumat from the 
StronesrrerpD SxiaTe. By H.G. Senrey, Esq., F.R.S., F.G.S. 
(Read February 26, 1879.) 
WHILE examining, with the assistance of Mr. W. Davies, F.G.S., 
the unarranged and more fragmentary remains of Pterodactyles from 
the Stonesfield Slate which are preserved in the British Museum, I 
was so fortunate as to detect two small slabs which contain, in good 
preservation, a small mammalian femur and a mammalian humerus 
of corresponding size. Mr. Davies has had as much of the matrix 
removed from these bones as was necessary to fully display their 
essential characters ; and I now offer to the Geological Society a brief 
account of the remains, for the opportunity of making which I would 
express my thanks to Mr. Waterhouse. It is perhaps impossible to 
determine with absolute certainty whether they belong to Amphi- 
therium, Phascolotherium, or to some new type, or whether the bones 
might not perhaps have belonged to two different animals; but, on 
the chance of their being naturally associated, the generalized mar- 
supial characters which they manifest make a useful contribution to 
our knowledge of that animal type, which has hitherto only been 
known, from Stonesfield, by rami of lower jaws. 
Frmuur. 
The right femur rests flat in the 
matrix, so as to expose the aspect 
of the bone, which during life was 
posterior and inferior, The ex- 
treme length of the specimen is 1,7, 
inch. It has a straight aspect, is 
moderately expanded proximally, 
less enlarged at the distal end, and 
has the spheroidal articular head in- 
clined to the inner side and looking 
slightly forward. The most re- 
markable feature of the specimen 
is the expansion below the articular 
head of the two trochanteroid pro- 
cesses, which make the width of the 
bone in this position something less 
than 6, inch. The inner trochanter 
is much the less massive of the two ; 
but its margin is imperfectly pre- 
served, and it was obviously thinner 
than the great trochanter. It ex- 
tends proximally to near the base of The outline shows the natural size 
the proximal articular head of the of the bone. 
boue, and had a narrow wing-like extension inward, curving some- 
what forward at its proximal margin ; but, as preserved, its internal 
Fig. 1.—Femur. 
