308 THE CANADIAN NATURALIST. [Vol. X. 



the lake and at the hike leveL Thej' are seldom found in the 

 arenaceous pehbles, but most abuudaotly in the more flattened 

 calcareous stone. I have obtained the following; fossils: — Steno- 

 pora fibrosa, Colnmnaria aheoJata, Athyrls headii, Strojjho- 

 mena alternata, S. deltoidca, Leptcena scricea, Orthis testudl- 

 Qiaria, 0. occidental is, 0. Jijnx, Oholella crassa, Modiolopsis 

 77iodiola]-is, Modiolopsis, (numerous undetermined species), Ci/r- 

 todonta harrietta, Orthonata sp.^ Ctendonta sp., Lyrodesma 

 jwststriata, Amhonychia radiata, Avicula demissa, Murchisonia 

 gracilis^ Cyrtolites ornatus, Orthocenis lamellosnm, Ormoceras 

 crehiseptum, Lejycrditia Canadensis and tails of Calymene. 



Life Belonging to the Terrace Deposits. — Dr. Bell gives a list'^^ 

 of many places in Ontario where the stratified gravels and sands 

 •contain fresh-water shells. To his list other collectors have added 

 localities. However, about the western end of Lake Ontario they 

 are very rare, and I have seen only one or two localities where 

 they are found although they occur near Niagara Falls. 



The principal locality is not in the terraces, but will be 

 <lescribed below. 



However we have remains in Burlington Heights more inter- 

 esting than shells. Many years ago in making the cutting through 

 the heights of the Desiardins canal, at an elevation of 70 feet 

 above the lake (about 38 feet below the summit), remains of the 

 mammoth Eutleplias Jacksoni ; horns of a wappti, Cervus Can- 

 tidensis, and the jaw of a beaver, Castor fiber, were found. In 

 1876, while making another excavation in the Heights the work- 

 men found a tusk and one vertebra of a mammoth. At a depth 

 of 30 or 40 feet from the top of the terrace there could have 

 been no beach on which these animals might have wandered. 

 Were the animals then unfortunate enough to be carried thither 

 on the ice, were they drowned in attempting to cross from one 

 side of the ancient valley to the other, or were their bones car- 

 ried thither by the floating ice? 



In several of the swamps north of Lake Erie teeth and bones 

 of mastodons have been found, but these belong to more modern 

 deposits. 



XI. — MODERN DEPOSITS. 



Most of the deposits of the present time consist of the soils 

 carried down by the streams into the Dundas marsh and Lake 

 Ontario. 



* Geol. of Canada, 1863. 



