THE NAUTILUS. 135 



sociation (3) was chiefly studied as typified by the swamp at 

 the head of Cargyles Pond to the east of the above-mentioned 

 localities and at the foot of the hill. This association seems to 

 be characterized by Succinea ovalis (totteniana*) . A limestone cave 

 association (4) was merely outlined by the fauna found in a 

 limestone fissure known as Devil's Den, situated on the north 

 side of the Boy's Half-way River (the brook flowing from the 

 above-mentioned artificial pond) a mile below the pond. The 

 limestone is partly leached out, with three entrances, and parti- 

 ally blasted out, making a fissure cavern. Here the larger shells 

 were quite common while the small ones were not noticed. The 

 fifth or fluvio-terrestrial association (5) borders the Housatonic 

 River and is characterized by Succinea avara. Although many 

 other localities were examined, all the species found are repre- 

 sented in at least one of the above associations as outlined in 

 the following list. 



The method of collecting the smaller species was to gather 

 leaf mould, moss and rubbish (always keeping each collection 

 separate), dry the material in the oven, pass it through a graded 

 series of sieves and carefully sort over each sifting. The method 

 used for finding the larger shells, as well as the smaller, was to 

 carefully scrutinize old wood and stones, especially the under 

 or moist side, bases of stumps and trees, especially the "saw- 

 dust" in their cavities, the underside of bark, etc. My wife 

 rendered me the greatest assistance in all of this tedious work. 



Notice is called to the absence of Cochlicopa lubrica which I 

 have found near Bridgewater, fifteen miles further north. The 

 Omphalinas also were not found. No distinctly Canadian fauna 

 species were noticed. 



Carychium exiguum (Say). Common at 1, less so at 8. 

 Polygyra tridentata (Say). Found at 4. 



Polygyra albolabris (Say). Occasionally at 1, 3 and 5, com- 

 mon at 2 and 4. 



Polygyra thyroides (Say). Found at 4. 



Polygyra hirsuta (Say). Found at 2 and 4. 



Polygyra fraterna (Say). Found at 2 and 4. 



Circinaria concava (Say). Found only at 4. 



Vitrea binneyana (Morse). Rare, and only found at 1. 



