POLYGYRA. 



265 



Fig. 100. 



p. uvulifera, 

 enlarged. 



, lY. 75 ; L. & 

 267. — Bland, 



the last abruptly deflected at the aperture, devious below, constricted and scro- 

 biculated; aperture very oblique, ear-shaped, ringent, very much narrowed; 

 peristome acute, patulously reflected, its terminations joined 

 by an oblong, tongue-shaped, deeply entering, excavated fold, 

 its right margin with a deeply seated lamella terminating in 

 a reflected, filiform uvula-like point, the basal margin with an 

 oblique, sinuous, tooth-like tubercle. Greater diameter 12, 

 lesser 11 mill.; height, 7 mill. 

 ITdix uvulifera, Siiuttleworth, Bern. Mitt., 1852, 199. — 

 Chemnitz, ed. 2, II. 420, PI. CXLVIII. Figs. 19, 20 (1853). 

 — Gould, Terr. Moll., III. 20. —W. G. Binney, Terr. Moll 

 Fr.-W. Sh., I. 87 (1869). — Pfeiffer, Mon. Hel. Viv., III. 

 Ann. N. Y. Lye. N. H., YII. 34, Fig. 13 (1858). 

 Helix floridifera, Reeve, Con. Icon., No. 699 (Aug. 1852). 

 Helix auriculata, minor, F^russac, Hist, PI. I. Fig. 3? (teste Pfeiffer). 

 Dcedalochila uvulifera, Tryon, Am. Journ. Conch., III. 157 (1867). 



Found plentifully on the Florida Keys, Key West, Little Sarazota Bay, Long 

 Key, Florida, Dallas, and at Cape Sable. As I also have specimens from 

 Corpus Christi, it probably inhabits the whole Gulf coast of the Southern 

 Region. 



P. uvulifera may be distinguished from P. auriculata by the character of the 



peristome, which is equally produced from the superior angle of the parietal 



process, to the base of the inferior tooth or fold, where it 



Fig. 161. ig reflected, sometimes appressed to the last whorl. The 



lower angle of the parietal process is connected with the 



inner termination of the peristome by a flat, more or less 



developed callus. The umbilical region is less open, and 



there is no groove within it on the last whorl. 



Jaw low, arcuate, ends blunt, anterior surface with about 



13 ribs, denticulating either margin. 



Lingual membrane (PI. VL Fig. B) with 23 — 1 — 23 teeth. There are about 

 8 perfect laterals. 



Genitaha as in P. auriculata. 



Animal of P. uvulifera. 



Polygyra auriformis, Bland. 



Shell rimately perforate, above depressed, with rib-like striie, beneath in- 

 flated, convex, almost smooth, and with microscopic spiral lines ; white, or 

 brown horn-color, thin ; spire very short ; whorls 5| - 6, rather flat, the last de- 

 flected, and shortly turned outwards from the preceding whorl, constricted, 

 scarcely scrobiculate ; aperture sub-horizontal, ear-shaped, contracted ; peri- 

 stome acute, continuous, the margins joined by a short linguiform fold, entering 

 within the aperture ; the right margin with an obtuse submarginal lamella, and 

 the base with an oblique, sinuous, tooth-like fold. Greater diameter 11^, lesser 

 10 mill. ; height, 6 mill. 



