io Bulletin 22 10 



ribs the whorls are marked by subequal and subequally spac- 

 ed, incised, spiral lines, of which 12 occur between the first 

 and second, and 17 upon the penultimate turn ; suture mod- 

 erately constricted ; periphery and the rather long base of 

 the last whorl well rounded, marked by the feeble extension 

 of the axial ribs and about 18 incised, spiral lines which 

 equal those of the spire. Aperture elongate-ovate ; posterior 

 angle acute ; outer lip rather thick ; columella short, curved 

 and reflected over the reinforcing base, anterior edge only 

 being free ; parietal wall covered with a thin callus. 

 Claiborne Sand bed; Claiborne, Ala. 



The fold is faintly perceptible from the outside. Very 

 rare. Height 3.5 mm. This shell has a strong resem- 

 blance to Melania claibornensis Heilprin. That species is rep- 

 resented with seven whorls and is more pointed, narrower, with 

 a much smaller aperture, judging from the figure of the type 

 with which I have compared this form. 



Turbonilla (Pyrgiscus) agrestis, n. sp, 



Plate IV, fig. 2 



Shell small, only 5 whorls represented in type ; surface 

 with four raised revolving lines, increasing to five on the 

 body-whorl , with the same number upon the base. There 

 are numerous raised axial ribs across which the spirals pass. 

 Umbilicus closed ; aperture ovate ; columella somewhat twisted. 



Width of broken scecimen, 1 mm. 



Hatchetigbee Bluff, Tombigbee River, Ala. 



A strongly marked species ; quite distinct. 



Levifusus trabeatus Con., var. 

 Plate V, fig. 3 



This is another variation possessing a revolving row of 

 incipient spines at the periphery with another finer line below. 

 It is much more like Fulgur in shape and is evidently a con- 

 necting link. The outer lip is Urate within. 



