264 



tending from the canal in a westerly direction immediately above the 

 swing bridge. P. ancillarla found there is also very beautiful, but 

 except in colour it diflfei's little from the form of P. heterostropha, Say, 

 commonly met with. Both species are found in co\npany in a depau- 

 perate form around the islands at the foot of the Little Chaudiere. 



On arriving at the swamp no time was spent in searching for the 

 minute land shells — many very rare — which it produces, but our party 

 at once repaired to the lake in its centre. Valvat.t sincera, Say 

 Zimncea palustris, MUll, were present in great abundance, with not a 

 few Planorhis dejlectus, Say, and P. exacutus, Say. The only bivalve 

 previously taken in the lake was Pisidium abditum, Hald., but on this 

 occasion, in addition to that species, were found P. ventricosHui, Prime, 

 and Sphcerhnn securls, Say — the former rare and the latter common 

 and more inflated than the shells occurring in the canal. 



Later in the season, in the ditch on the opposite side of the rail- 

 way from Dow's swamp, a small form of Physa (jyrina, Say, was taken 

 in large numbers. 



The third sub-excursion, which took place to Hull, was not 

 attended with very satisfactory results. Along the eastern slopes of 

 the hill overlooking the beaver meadow a few specimens of Mesodon 

 sayli were found. Liimiceri emarginata, Say, and Physa heterostropha 

 were taken in Scott's Creek; and in dried up pools beside the railway 

 we noticed myriads of shells of Limncea palustris. 



On the genipral excursion of the club to Kingsmere we obtained 

 Mesodon sayli, Zonites inornatus, a slug which is probably Pallifera 

 dorsalis, Binney, and a great many of the smaller helices. No locility 

 near Ottawa affoi'ds so many species of laud shells as King's Mountain 

 and the ravines which climb around its sides, but neither the coronal 

 lake near its summit, nor Kingsmere far below, appears to contain a 

 single shell. Many larger lakes in the Laurentides are equally unpro- 

 ductive. 



At Mohr's wharf, on the occasion of the excursion to the Chats, 

 Unio complanatns, Sol., U. radiatiis, Lamk., Limiuea catascopimn. Say, 

 L. caperata. Say, and Planorhis trivolvis were observed along the shore; 

 and tlie woods to the south afforded Mf.sodo7i albolohris, Patnla 

 striatella, IlyaJina arhorea, //. viridida, //. indealaia, Say, Oonuhcs 



