1891.] Geology and Paleontology. 913 
the penultimate, as in the species of Hippidium and the three-toed 
horses. The glenoid surface of the ERRE " ‘of —— a 
width, as in the Hippidiums, and not 
as in the horse and quagga. The Æ. zetels differs from the quagga 
in the very slight decurvature of the symphyseal portion of the pre- 
mariilary Sone x REREN nearer e horse, bari is even TY The 


incisor t 
seen in the two recent species mentioned. The patterns of the crowns 
of the superior molars are much like those of the two species named, 
but the internal inflections of the anterior and posterior borders of the 
external lakes are not so deep as in one or both of those of the Æ. 
quagga and Æ. caballus. The size of the skull is about that of the 
quagga. 
The skull is that of an adult hoe The frontal bone is crushed in 
between the orbits so as to crush the descending anterior plates of the 
former behind the nasal cavity. The free orbital borders and the 
pariétal bones are not crushed. It is singular that that part of the 
arch of the skull which presents the strongest resistance to pressure is 
crushed, while the weaker regions remain entire., Unless a stone 
occupied the exact position calculated to produce this result, it might 
be imagined that this horse was knocked in the head with a stone 
hammer, such as has been found in the same bed by Mr. Taylor.— 
E. D. COPE 
The Glacial Deposits at Hendon, England.—In a paper read 
before the London Geological Society, May 27th, 1891, Mr. Henry 
Hicks showed that glacial deposits had been spread out to a much 
wider extent over the Hendon plateau than had hitherto been sup- 
posed. There is evidence to show that these deposits have extended 
in a south and southwest direction across the Brent and Silk valleys, 
and now occur on most of the heights in the parishes of Kingsbury 
and Willesden. As the sands, gravels, and boulder clay which cover 
the Hendon plateau are found to rest on an undulating floor of Lon- 
don clay, the author considers it clear that the main physical features 
of this portion of Northwestern Middlesex were moulded at a very 
early stage in the Glacial period, and before the so-called middle 
sands and gravels and overlying upper boulder clay were deposited. 
At this time there could have been no barrier of any importance to 
prevent these deposits from extending into the Thames valley, and 
the evidence clearly points to the conclusion that the implement-bear- 
ing deposits on the higher horizons in the Thames valley should be 

