436 PROCEEDINGS OF THE ACADEMY OF Play, 



students of our laud snails. The toothless form occurs in ^Monroe 

 county, Tenu., where it was collected by Miss Annie Law, together 

 with specimeus provided with internal laminne. These were dis- 

 tributed lo ]\Ir. Biuuey, Dr. James Lewis, and probably others. 

 The Lewis collection was sold, and there are specimens fi'om this 

 source in the collections of George H. Clapp, G. K. Gude, the 

 Academy of Natural Sciduces, and perhaps others. The toothless 

 specimen illustrated in figs. 10-12 is No. 294 of the Biuney and 

 Bland collection, American Museum of Natural History, kindly 

 lent by 3[r. L. P. Gratacap. It is the individual figured by 

 Binney, referred to at the head of this account. 



The form was given specific rank by ]Mr. Binney, but in our 

 opinion ir is merely a subspecies of the variable G. gularis, distin- 

 guished by the wider umbilicus, and the absence of teeth in some 

 aduil spacimeu;. G. gularis theloides differs from lawce by its 

 very l^.iuiH umbilicu?. In G. lasmodon the umbilicus is still wider. 

 The size of the umbilicus varies a good deal in the North Carolina 

 specimens. Thus in specimens from Paint Rock, measuring 8 mm. 

 diam., the umbilicus is from 1 to 1.7 mm. wide. 



The young shells are always toothed (PI. XXV, figs. 14, 15), 

 there being a long outer lamella, a shorter baso-columellar, and in 

 eai-ly stages a small supra-peripheral plait. The umbilicus is broad 

 and the periphery situated high on the last whorl. The shell 

 figured measures 5 mm. diam. 



It is quite common ou both sides of the river at Paint Rock. 

 Two only on Bluff mountain. 



Gastroioata gaiaris decussata Pilsbry and Vauatt:). n. subsp. PI. XXV, figs. 5, 6, 7 

 S, 9, l:'.. 



Shell somewhat dull, brownish, narrowhj umbilicate, with moder- 

 ate or high, dome-shaped spire, composed of 8 flat whorls, the last 

 anfjul'ii- at the peripherij. Closely, sharply and strongly striate 

 above, less so beneath, where there are usually traces of spiral strice 

 near the periphery. Aperture lunate, peristome thin and acute, 

 armed within with a blunt tooth ou the middle of the columella, 

 and a high, short, erect lamella within the outer-basal margin. 

 Alt. 5.5, diam. 7.8 mm. Alt. 5, diam. 8.2 mm. 



Young shells (PI. XXV, figs. 8, 13, diam. (> mm.) are bicon- 

 vex, depressed, acutely angular or cariuate, more strongly striate 

 beneath than adults, and wltli the stride on the outer half of the 



