[45] 



b. Diam.=l\ mill. 

 ^ 4. Conulus minutissima, Lea. 



Plate 4, figure 63. 



Globosely turbinate, above obtusely elevated, below con- 

 vex, fuscous, minutely striate ; whorls 4; aperture transverse- 

 ly 'lunar, umbilicated. 



Diam. 1|, beigbt 1 mill. '■ 



Gl:. ';',G'j: Maine to Pennsylvania, Ohio. 



Distinguished by its small size, striate surface, and well de- 

 veloped umbilical opening. 



Mr. Morse has distinguished this species as the genus Punc- 

 turn, (sub-family Punctinse^ from the peculiar conformation of 

 the buccal plate, which is divided into sixteen distinct pieces. 



This is the smallest of our species. - l\Yv(qv:ia.i<-iii,-i:''Vi£^' 



GASTEODONTA, Albers. 

 ' 1. Gastrodonta gularis, Say. 



Plate 4, figure 39. 

 Sub-conical, shining, yellowish horn-color, translucent; 

 whorls 7 — 8, striate; suture moderately impressed, aperture 

 transverse, rather narrow, margin sharp, .extending beneath to 

 the centre of the base, which is barely perforate or closed ; 

 within thickened at the base by a callus deposit, and having 

 two parallel lamellar teeth, extending nearly to the basal mar- 

 gin of the lip. 



Diam. 7 — 9, height 5— 7 mill. Caar^.O-TlM^'o^'- ^ 



^Bast Tennessee, Greorgia, Alabama. 

 Sometimes one tooth is wantins;. 



2. Gastrodonta lasmodon, Phillips. 



Plate 4, figure 40. 



Depressed orbicular, shining, corneous, translucent ; whorls 

 7, narrow, very slowly increasing, minutely striate, suture 

 moderately marked ; aperture nearly circular, larninal teeth. 

 upon the internal base of the lip ; umbilicus large and deep. 



Diam. 6, height 3 mill. 



East Tennessee, North Alabama. -- . v>'T 



Much more depressed than the other species. Is smaller 

 than No. 1, and differs from it in the large umbilicus. 



