68 THE NAUTILUS. 



ground is covered several inches deep with decaying leaves. Most 

 of my collecting was done on hillsides having a northeastern exposure 

 and at an elevation of about 1550 feet. The list of species follows : 



Tebennophorus carolinensis Bosc. 



Vitrea indentata Say. 



Vitrea hammonis Strom. 



Vitrea ferrea Morse. 



Zonitoides arborea Say. 



Euconulus chersinas polygyratus Pils. Found under decaying 

 leaves far from the water. Rare. 



Pyramidula cronhhitei catskillensis Pils. 



Helicodiscus parallelus Say. 



Polygyra albolabris Say. Exceedingly common in a man-hole on 

 the pipe line which takes water from the Manor Spring to the Inn. 



Polygyra dentifera Say. 



Polygyra tridentata Say. Only the typical form. I saw no var. 

 juxtidens Pils. 



Polygyra hirsuta Say. I was much surprised to find this species 

 only under boards in fields exposed to the sun, and never in shady 

 places at all. 



Polygyra fraterna Say. 



Bijidaria pentodon Say. 



Cochlicopa lubrica Mull. Although I searched diligently I was 

 never able to find this species alive, four dead specimens being the 

 best I could do. 



Succinea ovalis Say (obliqua Say). Another shell of which it is 

 hard to obtain good specimens. The broken shells of this species 

 are quite common. 



Next year I hope to add some more names to this list. 



Haverford, Montg. Co., Pa., Sept. 9, 1907. 



SHELLS COLLECTED IN NORTHEASTERN MEXICO. 



BY A. A. HINKLEY. 



The species here listed were collected in December and January 

 of the past winter. At Tampico land and fresh-water forms were 

 scarce and had it not been for the rich find in a windrow of river 

 debris or drift the list would have been much smaller. This drift 



