Dll. W. KOVALEVSKY ON THE 
the same manner as in the scapula of Diplopus. My paper and Plates being already 
finished, I could not give a figure of this new specimen, and shall try to supply the 
want of it by a few explanatory remarks. 
The scapula in the collection, of Mr. Vinay belonged evidently to the largest species 
of Hyopotamus found at Puy, and in size equalled the scapula of Diplopus figured 
in Plate XXXY. The general aspect of this new specimen presented a great simi- 
larity to the one figured from Hordwell ; beginning from the neck, the bone broadened 
rapidly to its upper and broken extremity, and acquired the same remarkable breadth 
which is so conspicuous a feature of the scapula of Diplopus. The spine of the scapula 
was also very oblique, inclining outwards as in the scapula figured in Plate XXXV. 
The fossa glenoidea had precisely the same exceedingly circular outline as is seen in 
the figured scapula; the coracoid process did not project much, and was recurved in 
the same characteristic manner. On the outer margin of the neck, however, where 
I found a deep fossa in Diplopus , the scapula from Puy presented only a flattening. 
In general the resemblance was as great as could be between two animals belonging to 
the same family but to different genera. 
The Humerus. — I have been able to study many specimens of humeri belonging to 
liyopotamus from the Isle of Wight, as well as from Puy, but unfortunately not a single 
complete one. As is generally the case with fossil humeri, their upper or proximal head, 
being very spongy, is destroyed during the process of fossilization, while the distal extre- 
mity is well preserved. Compared with a humerus from Hordwell, the humeri from Puy 
and Hempstead proved entirely similar to it ; and as the Hordwell specimen, belonging 
to Diplopus , was the best preserved, I have figured it on Plate XXXVI. fig. 4, and 
my description of this humerus will apply equally well to both genera. As mentioned 
before, the proximal heads were broken in all specimens ; but seeing the Anoplotheroid 
affinities presented by the distal extremity, we may presume that the proximal head also 
resembled rather the Anoplotherium than the Suidse. In the first genus, as far as can be 
judged by a crushed Anoplotherium humerus in the British Museum, the great tuberosity 
did not overarch the bicipital groove so much as it does in Pigs and the Hippopotamus. 
We may, to a certain extent, infer the lesser overarching of the great tuberosity by 
marking the course followed by the crista anterior descending from this tuberosity, 
and which in liyopotamus runs in the middle of the anterior surface of the humerus 
(fig. 4), and not so much on the inner side of it as in Suina. The deltoid ridge meets the 
crista anterior a little higher up than in Anoplotherium , nearly as in the Hog ; and at the 
point of their meeting we see a conspicuous rugose flat surface for muscular attachment. 
The shaft of the humerus belonging to the Diplopus is very stout, thicker transversely 
than the humerus of a Reindeer, and much stouter hi antero-posterior depth. The 
transverse section is not so regularly oval, but much more triangular than in Pigs or 
Ruminants, with the apex of the triangle turned forwards. 
The inferior extremity of the humerus is very unlike that of any existing Ungulate, 
and presents a good intermediate form between the humerus of Anoplotherium and that 
