36 Observations on the Terrestrial 



edge is slightly indented at sliort intervals, the middle of this edge is roundly 

 projecting. (PI. 1, Fig. 13.) 



The lingual membrane, {PI. 1, Ficf. 10,) is usually long, having one hundred 

 and twenty rows of plates, each row being composed of thirty-five plates, 

 17-1-17, central plate nearly square, tridentate, central denticle sliorter than 

 plate, and slender, side denticles minute, laterals six, bidentate, merging into 

 denticulated uncini. 



Leucochila pentodon, Say. 



In all parts of the State, but not common. Found in very wet 

 places. 



Buccal plate, [Fig. 85, J slightly arcuate, of the same 

 length throughout, sides blunt, irregularly wrinkled 

 longitudinally, cutting edge straight, minutely notched. 

 Fig. 85. Lingual membrane, 64-10-1-10, central plate very 



narrow, notched at outer posterior corners, having three minute denticles, 

 laterals square, notched at outer posterior corner, having one long stout den- 

 ticle, and one smaller, uncini denticulated, inner denticle prominent. {PI. 10, 

 Fig. m.) 



Leucochila contracta, Say. 

 Found abundantly in a grove of beech at Bethel, Maine, and 

 has been met with in several places throughout the southern 

 portions of the State. Rare. 



Leucochila corticaria, Say. 



Occurs rarely at Bethel, Maine, and abundantly at Gorham, 

 Maine, where I found them on the upright trunk of a dead beech, 

 in the interstices of the bark, fi'om its base to a distance of twenty 

 feet from the ground, in company with I. Gouldii, In confinement 

 they are quite active, and afford every facility for observation. 

 Body as long as the shell ; head, back, and tentacles, smoky or 

 claret colored, posterior portion bluish ; disk white, tail unevenly 

 rounded, body coarsely granulated by the largeness of the mucous 

 glands ; superior testacies long and slender, eyes at the tip, very 

 large and conspicuous; inferior tentacles short and obtuse. 



Buccal plate, {Fig. 87,) slightly arcuate, tapering at 



the sides, cutting edge very slightly elevated in the 



Fig. 87. centre, ,9,nd longitudinally striate in the middle of plate. 



