Dr. J. E. Gray on the Madagascar River-Hog. 45 
Localities. Limekilns Old Quarry, near Limekilns House, 
near East Kilbride, from shale between the first and second 
limestones of the Calderwood series, Lower Carboniferous 
Limestone group; Calderside Old Quarry, near Kast Kilbride, 
from a similar geological horizon: collected by Mr. James 
Bennie. Mousewater, opposite Lambecatch, near Wilsontown, 
from shale between two thin limestones of the Lower Carbo- 
niferous Limestone group; quarry near Hillhead, near Wil- 
sontown, from shale over the Guildhouse Limestone, Lower 
Carboniferous Limestone group: collected by Mr. A. Macco- 
nochie (collection of the Geological Survey of Scotland). 
EXPLANATION OF PLATE IV. B. 
[The figures are all considerably enlarged. ] 
Fig. 1. Hyphasmopora Buskii, a bifurcating stem, showing the longitu- 
dinal series of cell-depressions, with a peculiar swelling of the 
interstitial surface. 
Fig. 2. Tie same. In this specimen are visible a few of the true cell- 
orifices. 
Fig. 3. The same, showing the opposite face or interstitial zone, with its 
single row of cell-depressions. 
Fig. 4. The same, a similar specimen to the last, but the branches with 
a wider angle of bifurcation. 
V.—On the Madagascar River-Hog (Potamochcerus), and on 
the Skulls of the three Species of the Genus. By Dr. 
J. H. Gray, E:R.S. &e. 
[Plate IV. A.] 
FLAcourT, in his ‘ History of Madagascar,’ notices a wild 
boar in that island; and D’Aubenton, in his additions to 
Buffon’s ‘ Hist. Nat.’ xiv. p. 390, describes a dry head of a 
““sanglier de Madagascar” in the Cabinet of Paris, which he 
says is that of a “‘cochon de Siam ;” but by his description it 
is evidently that of a river-hog (Potamocherus). I noticed it 
as a species of that genus in ‘ Proc. Zool. Soc.’ 1868, p. 38, 
more especially as Mr. Sclater informed me that there was 
a living specimen of the animal from Madagascar in the 
Garden of Plants at Paris; and in the ‘Catalogue of Car- 
nivorous, Pachydermatous, and Edentate Animals in the 
British Museum,’ 1869, p. 344, [ named it Potamocherus 
madagascariensis, observing that I was not aware of any spe- 
cimen in this country. I now find, which had escaped me 
