462 THE STRUTHIONIDAE. 
Shell Marl :—This substance, described above, is much employed 
as a manure, and occasionally also as a whiting or wash-material. It 
occurs, more or less, all over the Province, but has been worked more 
especially, in the townships of Bentinck, Carrick, Brantford, King, 
W. Gwillimbury, Scarborough, Thurlow, Sheffield, Olden, Nepean, 
and W. Hawkesbury, in Canada West; and near Montreal, &c., in 
Canada Kast. 
Sand for Moulding :—Good sand for this purpose, has been ob- 
tained from the neighbourhood of Dundas, and also at Sydenham 
(Owen Sound.) 
Peat :—ULarge deposits of this useful substance are known to occur 
in many parts of the Province, but hitherto, on account of the abun- 
dance of wood, they have been generally neglected. Some of the more 
important, localities comprise: Longueuil, opposite Montreal, and 
" many places along the south shore of the St. Lawrence, between that 
point and the Riviére du Loup (Sir W. Logan). Also La Valtrie, and 
the seigniory of Cap de la Madelaine, on the north shore. The ex- 
plorations of the Geological Survey have made known, likewise, a 
large peat area on the south side of the Island of Anticosti. In 
Western Canada, peat occurs chiefly in the townships of Plantaganet, 
Clarence, Cumberland, Gloster, Goulbourne, and Westmeeath, in the 
Ottawa region. Also in the townships of Humberstone and Wain- 
fleet, on Lake Erie. 
,* The conclusion of this Essay, embracing a general summary of Canadian 
Geology, will appear in the next number of the Journal. 
THE STRUTHIONIDAE: THE EXTENT AND DIVISIONS 
OF THE FAMILY, WITH ITS SYSTEMATIC 
POSITION AND RELATIONS. 
BY REV. WILLIAM HINCKS, F.L.S., ETC., 
PROFESSOR OF NATURAL HISTORY IN UNIVERSITY COLLEGE, TORONTO. 
Having on a former occasion laid before the Institute a scheme for 
an improved arrangement of Birds founded on principles which I be- 
lieve to be applicable to the whole animal kingdom, and having after- 
wards, on ‘occasion of the exhibition of an interesting specimen, at- 
