62 AMERICAN JOURNAL 



3. Dsedalochila pustula, Ferussac. 



Plate 10, figures 6, 17. 



Shell small, depressed, lightly striate ; spire scarcely raised, 

 suture well impressed ; whorls 4, convex, subangulate on the 

 periphery, and more convex below it, deflected at the aperture ; 

 aperture narrow, arcuate, impinging on the umbilicus ; teeth as 

 usual in the group, viz., one V-shaped parietal tooth and two 

 tubercular lip teeth margining a central notch ; umbilicus small 

 and deep, with a groove revolving within it, which forms a raised 

 lamina on the basal part of the interior of the shell. Reddish 

 brown, with short hairs. 



Biam. 5, height 3 mill. 



Texas, Georgia ; St. Augustine, Florida. 



This shell and pustuloides were confounded by authors until 

 recently distinguished, and the latter described by Bland. D. 

 pustula is distinguished by its narrower umbilicus, and the um- 

 lical groove, and corresponding raised internal lamina ; the lat- 

 ter is only to be seen by breaking the whorl. 



4. Dsedalochila Texasiana, Moricand. 



Plate 10, figures 5,36,38. 



Shell orbicular, depressed, rather solid, ridged above, smooth 

 below ; spire scarcely elevated, suture moderately impressed ; 

 whorls 5, slightly convex above, subangular at periphery, quite 

 convex below, deflected at the aperture ; aperture crescentic, 

 with the lip margins joined by a large V-shaped tooth on the 

 body whorl, outer lip with two denticles closely placed, and a pit 

 between them ; umbilicus minutely perforate. Pale horn color. 



Diam. 9, height 4 mill. 



Texas ; Tamaulipas, Mexico. 



5. Dsedalochila triodontoides, Bland. 



Plate 10, figures 10, 31. 



Perforate, orbicular, depressed, thin, subpellucid, obsoletely 

 striate above, smooth beneath ; whorls 5, somewhat convex, de- 

 flexed at the aperture, subangulate on the periphery, and very 

 convex below ; aperture lunate, oblique, the extremities of the 



