2i:5 



IIijaJ'iiM n'dlda, Miiller. — Tiiis is one of a number of species found 

 here whicli occm- also \\\ Europe, but whicli are indigenous to America, 

 and not imported. In low-lying |)laoes it is not uncommon. The 

 woods near Billings' Biidge afllord it in considerable numbers nnder 

 logs and driftwood lying along the outlet of Dow's swamp. In July 

 1883, it was })articularly abundant in company with Succinea ovalis on 

 the verge of the brook flowing through the beaver meadow in Hull 

 but l)Oth were abicut on every occasion on which I visit>id the place 

 during the past season. Owing to the moist nature of its habitat, it is 

 able to venture abioad in the day time, and I have more than once 

 observed it on warm, sunny days moving about actively early in the 

 afternoon. In coiiinion with sjjecies which occupy localities subject to 

 inundation, it is capable of living some time under water. Specimens 

 kept forty-eight hours m an inverted test tube, immersed in an aqua- 

 rium and containing no free air, were apparently lifeli-ss when taken 

 out, but soon recovered If placed uncontined in the aquarium, they 

 lind their way to the sides and climb to the surface of the water as 

 quickly as possible. //. nitida is the largest of our Injaibice, measur- 

 ing often 7 mm. in diameter by^ 4-;^ mm. in height. 



Ilycdina arborea, Say. — This occurs in hardwood gro\es every- 

 where, and sometimers in the driest stations in open fields. Indiffer- 

 ence to its surroundings leads it to frequent even ))ine woods, which 

 other species always avoid. It often burrows to a considerable depth 

 in the under side of rotting logs. A few of the shells found here have 

 a greater diameter o*" 56 mm., but the average of twenty specimens is 

 only 5T mm. 



Ilijfdiiia vlrbiala, il/e.'zA:e.-— Like //. nitida, tliis shell has a wide 

 distribution in Europe as well as in America. It manifests like that 

 8pecies, but not to the same extent, a preference for moist localities, 

 and is almost as common as //. arborea. It may be /ound near the 

 city on the left .shore of the Kideau canal, immediately below the Bank 

 street bridge. It greatly resembles //. arborea, but may be readily 

 distinguished from that species, when viewed from above by the sudden 

 enlargement and comparatively greater width of the body whorl. It 

 is also smaller by a little than //. arborea, seldom attaining more than 

 5 mm. in ijreater diameter, and has one whorl less. 



