AMPULLARIA GLOBOSA. 9 



a little undulated instead of being wrinkled; 

 these undulations being very perceptible to the 

 finger within the shell: aperture within on the 

 margin thickened equally all round and fulvous, 

 with a slight groove for the reception of the 

 operculum, hardly visible but palpable: within 

 somewhat perlaceous; a little darker on the 

 columella: umbilicus small, narrow: operculum 

 calcareous, deeply and concentrically rugose, so 

 as to appear stratified; nucleus on the side 

 towards the labium, submarginal. 



"Length less than one inch and four-fifths; 

 greatest breadth, about the same. 



"For this interesting species, we are indebted 

 to Captain Le Conte, of the Topographical 

 Engineers, who informed me that he found it in 

 St. John's river, in Florida." Say. 



This species, as well as "Paludina elongata, 

 Swainson" figured in this work under the name 

 of P. bengalensis, are both given by Say as 

 from the river St. John's, and as they have 

 never been heard of since as occurring there, 

 it is probable that they were introduced acci- 

 dentally, as they are found together at Calcutta. 



