162 



LIFE OF THE PLEISTOCENE 



Sphaerium orbicularis ( = partumeium) 

 Campeloma decisum 



Planorbis bicarinatus ( = anlrosus) 



Heron 153 lists sixteen species from the vicinity of Ottawa,as noted below. 



Vahata tricarinata 



Amnicola limosa porata 



Planorbis campamdatus 

 " parvus 



" exacutus { — exacuous) 

 " bicarinatus ( = antrosus) 



Physa heterostropha 

 " ancillaria 



Ancylus species 



Galba desidiosa ( = obrussa) 



Sphaerium rhomboideum 



sulcatum {—simile) 

 Pisidium ventricosum? 



" species 

 Elliptio complanatus? 



On the shore of Hemlock Lake, near Rockcliffe Park, a bed of shell marl 

 occurs, which is said to be five feet in thickness. This is probably also referable 

 to the Nipissing stage. The following molluscan and other species have been 

 identified from this marl: 154 



The elevation of the marl beds is 18-20 feet above the present level of the 

 lake, which is 15 feet above the Ottawa River. The marl fauna is said to 

 consist of smaller individuals of species now living in the lake, due either to 

 adverse physical conditions or to a boreal climate. 1543 



Pisidium abditum 

 Vahata tricarinata 

 Amnicola limosa porata 

 Physa heterostropha 

 Planorbis bicarinatus { = antrosus) 

 " campamdatus 

 " parvus 

 Galba galbana 



" desidiosa { = obrussa) 



Lymnaea stagnalis appressa 



Euconidus fulvus 



Vitrea indentala 



Zonitoides arborea 



Pyramidida altcrnata 



Polygyra albolabris 



" albolabris dentifera 

 " sayii (=sayana) 



Cypris species 1643 



Near Cobalt, Ontario, heavy beds of marl occur which contain a large and 

 varied molluscan fauna. These are listed by Walker as indicated below: 156 



Sphaerium simile 



striatinum 

 Muscidium secure 

 Pisidium kirhlandi 

 " contorlum 

 " rotundatum 

 " noveboracense 

 mainense 



Pisidium vcsiculare 

 Vahata tricarinata 

 Physa heterostropha 

 Ancylus parallelus 

 Planorbis campamdatus 



antrosus striatus 

 " exacuous 



" medianum " 



" pauper xidum 



153 Trans. Ottawa Field Nat. Club, I, p. 40, 1880. 

 164 Ami, Rep. Geol. Surv. Can., 1899, p. 56, G. 

 154a Whittaker, Ottawa Nat., XXXII, pp. 14-18, 1918. 

 166 Ottawa Nat. XXI, p. 180. 



parvus 



deflectus 



hirsulus 





