1895. PROCEEDINGS OF THE NATIONAL MUSEUM. 25 



The parietal tooth in R. gtippyi is rarely absent, even in specimens 

 hardly mature; in R. semilimata only the very oldest and most callous 

 specimen shows any trace of it. 



RINGICULA CHIPOLANA, new species. 



Shell small, elevated, slender, faintly grooved all over, with four and 

 a half whorls; spire about equal to the aperture, which is longer than 

 wide, with a callous body-lip and reflected margin. Longitude, 2.2; 

 maximum diameter, 1.4 mm. 



Habit((t.—ChiY)o\a beds (2211); in the lower bed at Alum Blufif, 

 Chattahoochee Eiver, Florida. 



2>jj('.— No. 113865, U. S. N. M. 



This species is intermediate in size between R. fJoridana and R. 

 guppyi, and is sculptured like them, but has the form of R. scmilimaf a, 

 especially the elevated spire, but with a proportionately narrower 

 mouth. It differs from the very similar R. biplicata, Lea, by the absence 

 of any denticles or lira3 on the outer lij) when mature. 



TORNATINA INCISULA, new species. 



Shell small, subcylindrical, slightly larger anteriorly, aperture as 

 long as the shell; spire coiled in one plane, so that in profile only the 

 small bulbous nucleus projects above the last whorl ; surface smooth, 

 hardly polished, marked only with incremental lines, and in some speci- 

 mens with a few faint incised spiral lines about the base; suture deeply 

 channeled, its margins produced and sharp, forming the posterior end 

 of the shell, except for the minute globular nucleus which, when not 

 lost, is quite conspicuous; whorls, about four, the last enveloping; 

 aperture very narrow and deeply notched at the suture, anteriorly 

 rounded, the thin, sharp outer lip passing insensibly into the short, 

 stout, arched pillar, which is bounded on tlie left by a sharp groove, 

 sometimes deepened to a chink, and carries a single, oblique, sharp 

 plait; a thin callus covers the body, and the outer lip is somewhat 

 produced in the middle. Longitude of shell, 5.5; maximum diameter, 

 2.5 mm. 



Habitat.— Chiiwla beds (2211, 2212, 2213), Florida, where it is 

 abundant. 



Types.— :So. 113867, V. S. N. M.; and in the collection of T. H. 

 Aldrich. 



This species is more slender than T. canaliculata, Say, and has the 

 spire so coiled as to be invisible, and the sntural channel extremely 

 deep and sharp-edged. 



TORNATINA MYRMECOON, new species. 



Shell small, long-ovate, of three and a half whorls beside the minute 

 globular nucleus; surface smooth or marked only by faint incremental 

 lines and microscopic spiral strire; aperture slightly shorter than the 



