26 THE NAUTILUS. 



Shell figured (Knox Co.,) 5. 1x4. 2x2. 1mm., whorls 5, 23 

 grooves on body whorl. 



Largest, Knox Co., 5. 7x4. 8x2. 7mm., whorls 5, 26 grooves on 

 body whorl. 



Largest, Knoxville, 5. 9x5. 0x2. 8mm., whorls 5, 34 grooves 

 on body whorl. 



Smallest, Knox Co., 2. 1x1. 9x1. 1mm., whorls 3, umbilicus 

 completely covered. 



The largest shell seen is from "along Coosa River, 2 miles 

 N. of Wetumpka, Ala.," it is 8. 0x6. 8x3. 3mm. whorls 5|, 28 

 grooves on body whorl. 



FIG. 1. VITREA CRYPTOMPHALA. 



Types from a lot of over 400 shells collected by the late Mrs. 

 George Andrews and labeled "Knox Co., Tenn." A lot of 18 

 shells in her cabinet series are labeled " Knoxville, Tenn." : they 

 all probably came from near Knoxville, perhaps from a favorite 

 ' ' hunting ground ' ' of hers, ' ' The Cliffs ' ' on the south side of 

 the river. Type No. 7365 of my collection. Cotypes in Acad. 

 Nat. Sci. Phila. (No. 112421), U. S. Nat, Mus., and collection 

 of Dr. Bryant Walker. 



At first I was inclined to consider this a variety of V. caroli- 

 nensis, but the flatter spire, the umbilicus covered at all stages oj 

 growth, the less excavated umbilical region and the wider aper- 

 ture indicate a good species. I examined 250 V. indentata from 

 41 localities and 110 carolinensis and var. wetherbyi from 15 lo- 

 calities and found no intermediates. 



In addition to the Knox Co. shells I have cryptomphala from 

 14 localities in Alabama, San Antonio, Tex., McComb City, 

 Miss., Fayetteville, Tenn., and Albion, 111., nearly 600 shells 

 in all. A sectioned shell shows the thickening of the columella, 

 caused by the callus, clear to the apex. 



