231 



liills along the right bank oT the Gatineau, from Wright's Bridge to 

 Gilniour'y mills, presenting every variety of soil and hygrometric con- 

 ditions, should furnish this shell if it is to be found here. Pallifera 

 dorsalis is another species that we may soon add to our list. 



In Adams' and Goodwin's catalogues appear three other species, 

 which, though more southerly in their I'ange than J/, dentiferus and 

 r. dorsalis, the presence of M. thijroides at Casseloian leads me to hope 

 will be found within the range of the club's operations. These ai"e 

 Zonites Jaliyinosus, Triodopsls jxilli-xta and T. trldentata. All 

 occur in the Adirondacs and at Toronto — T. trideatata coming east at 

 least as far ;is Belleville. 



There is a record of Pupa fallax, under the name of Ihdbnus 

 luirjinatas, in D'Ui'ban's list, and also of lli/cdina c:tpseUa from Mon- 

 treal, but these species I should not expect to find near Ottawa. 



Not more than six possible additions to our list remain to be 

 made. But a record of the occurrence of species, with remarks on their 

 habits and relative abundance or scarcity, are only the first though 

 necessary steps towards a satisfactory knowledge of our terrestrial 

 mollusca. Their life history is still unwritten and opens up to the 

 student a wide and fruitful field of observation. 



