CANADIAN PLEISTOCENE FLORA AND FAUNA. 



331 



stage of American geologists, covered the Toronto formation with a com- 

 plex series of layers of boulder clay and stratified sand and clay reaching 

 a thickness of 200 feet at Scarborough Heights. 



Accounts of the fossils of the Toronto formation have been given in 

 previous reports of this Committee and in various articles in geological 

 journals, but in this final report it is thought wise to give a more complete 

 list of the species collected, including a large number that have not yet 

 been published. As the trees will be taken up in Professor Penhallow's 

 report, the present list is confined to the interglacial fauna. The forms - 

 occurring in the lower, warm climate beds will be given first, and after- 

 wards those of the cool climate. 





J) 



I 



Fauna of Warm Climate Beds, Don Valley, 



Vertebrata : possibly mammoth or mastodon and bison, and an undeter- 

 mined fish. 

 Arthropoda : several undetermined beetles and cyprids. 

 Mollusca : 



Unio undulatus 



rectus 



luteolus 



gibbosus 



phaseolus 



pustulosus 



trigonus 



occidens 



solidus 



clavus 



pyramidatus 



Anodonta grandis, not reported from Canada 



. still living in Lake Ontario. 



still living in Lake Erie, but not reported 

 from Lake Ontario. 



not known in the St. Lawrence system of. 

 waters, but living farther south. 





Sphaerium rhomboideum 

 striatinum 

 sulcatum 

 solidulum 

 „ simile (?) 



Pisidium Adamsi 



„ compressum 



„ novaboracense (?) 



Pleurocera subulare 

 ,, elevatum 



,, Lewisi (?) 



Goniobasis depygis 



„ Haldemani 



Limnaea decidiosa 

 „ elodes 



Planorbis parvus 



,, bicarinatus 



Amnicola limosa 



„ porata 



„ sagana 

 Physa heterostropha 



,, ancillaria 

 Succinea avara 

 Bythinella obtusa 

 Somatogyrus isogonus 

 Valvata sincera 



„ tricarinata 

 Campeloma decisa 

 Bifidaria armata (land snail) 



In all there are thirty-eight undoubted species of molluscs, and three- 

 more probably, included in the fauna. Of these eight or ten have not been 

 reported from Lake Ontario, but occur farther south. 



