id PROCEEDINGS OF THE GEOLOGICAL SocIETY. [June 16, 
Piccadilly, has kindly submitted to my inspection the entire ramus 
of the under jaw of the Megaceros hibernicus from the brick-earth 
at Ilford, Essex, obtamed by himself upon the spot. This specimen, 
like Mr. Ball’s, has undergone the same amount of change as the 
other mammalian -fossils from that pleistocene deposit. With the 
Megaceros Dr. Cotton also obtained a considerable portion of the 
lower jaw of the Castor europeus; a circumstance which is inter- 
esting in so far as remains of the Megaceros have been found simi- 
larly associated with the Beaver, now extinct in England, though still 
existing on the continent, by Mr. Whickham Flower, in a subturbary 
deposit at Hilgay, Norfolk. 
I have not seen any authentic Irish specimen of the Megaceros so 
niuch fossilized, or of the colour of those from the Essex pleistocene 
strata and from the Devonshire cavern. The specimens submitted 
to me by Mr. Brown of Stanway from the till at Walton, by Dr. 
Cotton and Mr. Ball from the brick-earth at Ilford and Grays, and 
by Mr. M*Enery from Kent’s Hole, were severally obtained by 
those gentlemen in person at the localities mentioned. Instances have 
also occurred of English collectors having discovered fossil remains 
of the Megaceros in England without bemg aware of their nature and 
rarity. In making a list of the fossils m the collection of the late 
Mr. Gibson of Stratford, Essex, chiefly obtaimed from the pleistocene 
deposits in that county, and which since his decease have been libe- 
rally presented by his son, the Rev. R. Gibson, M.A., to the Royal 
College of Surgeons, I found that a considerable portion of the ramus 
of the lower jaw, with the molar teeth of the Megaceros hibernicus, 
had been labelled Bos. It was in the same fossilized condition as 
the true Bovine remains from the brick-earth, and as the ramus of 
the jaw of the Megaceros from Ilford, in Dr. Cotton’s collection. 
I have pointed out the distinctions between the upper molars of 
Megaceros and those of Bos in my ‘ British Fossil Mammalia,’ p. 450: 
those of the lower molars are as easily recognizable. In the great 
Bovines, where the size of the teeth is nearly the same as in Mega- 
Fig. 2. 
Hl. 
| a | 
|), a 
ul | | ie l | 
Last lower molar. Bos primigenius. Last lower molar. Megaceros. 
ceros, the anterior outer interspace of the last molar (fig. 1), and the 
outer interspace between the two lobes of the first and second molars, 
