Descriptions of Nevj Species of Shells. 131 



Shell rhomboidl y ovate, covered with an olivaceous-yellowish 

 epidermis, beneath which usually appear two purplish bands 

 encircling the body whorl ; spire short ; whorls about four, the 

 upper ones much eroded, the upper portion of the last whorl is 

 shouldered by a series of large, obtuse, and irregular tubercles, 

 about four or five in number, there is also a slight tendency 

 towards thickening in the ventral portion of the whorl ; aper- 

 ture ovate, effuse above and below ; right lip thin ; columellar 

 lip usually stained with purple above and below, reflected so as 

 partially to cover a deep umbilical depression, which, however, 

 is continued towards the base, forming a channel much resem- 

 bling that of the umbilical region in Natica. 



Length 0.83 inch (21 millim.). Diam. 0.63 inch (16 millim.). 



Length of aperture 0.61 inch (16 millim.). 



Breadth of do. 0.31 inch (8 millim.). 



Habitat. — Holstein river, near Knoxville, Tenn, where it was 

 collected by our associate, O. "W. Morris, and also by Mr. An- 

 thony. 



Obs. — Allied to A. salebrosa, but has the tubercles of its last 

 whorl larger, more obtuse, and irregular, and fewer in number. 

 In adopting the above name for this species, proposed by Dr. 

 Budd, I pay a deserved compliment to one of the most indus- 

 trious and ardent naturalists in our Western States ; though, 

 in so doing, I reluctantly depart from a wholesome recom- 

 mendation formally promulgated, first by the Scientific Congress 

 of Great Britain, and afterwards by that of America. It is to 

 be regretted that this recommendation has been so little heeded, 

 but where the recognised laws of nomenclature hardly restrain, 

 mere suggestions will be of little avail. 



2. Cyclostoma iiioniatiuii. 



Plate I. Fig. 7. 

 T. umbilicata, orbiculato-subdepressa, subtend, striatum, stramineo- 



