338 IN LOWER FLORIDA WILDS 



and lamellae. There is evidence to show Isomeria 

 has developed from Labyrinthus. The aperture 

 armature being no longer needed became dwarfed 

 or rudimentary, or even wholly absent. 



The land snails of the Northern States live on 

 the ground, usually under leaves, stones, or logs, 

 but in tropical and semi-tropical countries some 

 of them are strictly arboreal and many others are 

 partly so. In the pine woods of southeastern Flor- 

 ida several species hide under the rocks during the 

 dry season, and often crawl a short distance up 

 the trunks of the trees in wet weather. Along the 

 sandy land of the outer beaches two forms are 

 abundant which, during the rainy season, climb 

 up the low scrub. One of these is a Cerion, with 

 a cylindrical white shell which was probably 

 derived from the Bahamas. Several years ago 

 I was at the shore near the head of Biscayne Bay 

 where I found dead shells of this species in great 

 numbers, but no living ones. I searched in vain 

 the bushes and grass. Finally I stumbled over a 

 tussock of dead grass overturning it, and among 

 its roots were hidden hundreds of the little fellows. 

 As the weather was quite cold they had doubtless 

 hidden in these half buried roots for protection. 



