EASTERN PROVINCE SOUTHERN REGION SPECIES. 381 



above and flatteDtd and slightly striated beneath, but again, as it 

 passes towards and beneath the aperture, dilated and convex. This 

 change of form gives to the last whorl a distorted appearance. The 

 internal lamina is on the columellar wall of the contracted and flat- 

 tened portion of the last whorl, and runs obliquely in the direction of 

 the ajierture, attaining a length in a large specimen of about 6"""". 

 The character of the aperture is most like that of ccrcolus, but in that 

 species the last whorl has none of the peculiarities above described. 

 The internal lamina is found in a majority of specimens, but not in all; 

 it can generally be seen through the outer wall of the shell. 



The upper figure is engraved directly from a photograph on wood. 



Jaw as usual in the genus ; over 12 ribs. One jaw examined has a 

 decided median projection. 



Lingual membrane with 22-1-22 teeth, of which 9 are laterals, the 

 tenth tooth having its inner cutting point bifid (Terr. Moll., V, Plate 

 VI, Fig. M). 



I can now state that cereohts, Carpenter iana, septemvolva, volvoxis, 

 and Fehigeri have the same dentition. In all the splitting of the 

 inner cutting point commences at the tenth tooth. The species also 

 agree in their genitalia. 



Genitalia as in P. septemvolva. 



Polygryra Febigeri, Bland. 



Shell umbilicate, orbicular, flat, thin, shining, pale or reddish horn- 

 colored, with rather distant rib like strioe above, finely no 415. 

 striated beneath; spire almost level; suture deep; whorls 

 5^ to G, rather couA^ex, regularly increasing, the last an- 

 gular at the periphery, inflated below; umbilicus funnel- 

 shaped; aperture oblique, kidney-shaped; peristome thick- 

 ened, little reflected, the margins joined by a strong, tri- 

 angular callus. Greater diameter 8^, lesser 7^"""; height, P-Fciiaen. 



Helix Febigeri, Bland, Am. Joiirn, Conch., ii, 373, pi. xxi, fig. 10 (1866).— W. G. BiN- 



NEY, L. & Fr.-W. Sh., i, 108, fig. 184 (1869). 

 Polygyra Fibigeri, Tkyon/Aiii. Journ. Couch., iii, 160 (1867).— W. G, Binney, Terr. 



Moll., V, 285. ^ 



New Orleans; Mobile; also Louisiana. A species of the Southern 

 Region. 



This species certainly differs from P. cereolus, Muhl., septemvolva, 

 Say, volvoxis, Parr., and Carpenieriana, Bid., the four species of the 



