264 TERRESTRIAL AIR-BREATHING MOLLUSKS. 



ing only the penultimate whorl ; aperture sub-horizontal, ear-ehaped, ringent, 

 almost closed ; peristome continuous, its terminations joined by an oblong, en- 

 tering, excavated fold, the right margin furnished within 

 Fig. 159. .^yj^jj j^ deep lamellar fold, and forming a subacute angle 



with the basal margin, on which is one broad tubercle. 

 Greater diameter 16, lesser 13 mill.; height, 7^ mill. 



Polygyra aiiriailata, Say, Nich. Encycl., 3d Am. ed. (1819) ; 



Jouni. Phil. Acad., I. 277 (1818) ; Binney's cd., 10. 



„ . , , , Helix miriculata, YiuwssAC, Hist., PI. L. Fig. 4(1822). — 



P. OMnc«/am, enlarged. ' ' ' o v / 



BiNNEY, Bost. Journ. Nat. Hist., III. 384 (ex parte), PI. 

 XIX. Fig. 1 (1840), excl. syn.; Terr. Moll., II. 186, PI. XL. Fig. 1 (left hand). 

 — Leidy, T. M. U. S., I. 255, PI. IX. Figs. 5, 6 (1851), anat. — DeKay, 

 N. Y. Moll., 47, PL III. Fig. 28 (1843). — Pfeiffek, Mon. Hel. Viv., I. 417 ; 

 IV. 318, excl. var. (1853). — Chemnitz, ed. II. 371, t. Ixv. Figs. 3, 4. — 

 Deshayes in F6r. Hist, 76 (excl. var.), PI. I. Fig. 4; in Lam., VIII. 112 ; 

 ed. 3, III. 308. — Reeve, Con. Icon., No. 700, excL Fig. (1852). —Bland, 

 Ann. N. Y. Lye, VII. 26, Fig. (1858). —W. G. Binney, Terr. Moll., IV. 

 73; L. &Fr. W. Sh., I. 87(1869). 

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



St. Aucrustine, Enterprise, Lake George, and Indian River, Florida. It is 

 confined to the Florida Subregion. 



Animal longer than the breadth of the shell, acute behind, above granulated 

 and blackish, beneath and each side white ; eye-peduncles long, slender, and 

 tapering ; tentacles short, and of nearly equal diameter. Shell carried as in 

 P. septemvolva. 



P. auriculata may be distinguished from the allied species by its larger 

 size, the oreater development of the several parts of its curious aperture, and 

 especially by the sudden outward deflexure of the central part of the labrum, 

 which has a deep scrobiculation behind it, corresponding with the upper tooth 

 within the aperture. The portion of the labium extending from the inferior 

 angle of the parietal intruded tooth is erect, and more elevated than in any 

 other of the species. 



Jaw as usual in the subgenus ; ten ribs. There are 26 — 1 — 26 teeth on the 

 lino-ual membrane. The inner cutting point of the thirteenth tooth is bifid, so 

 that there are 12 laterals. PI. VI. Fig. A. 



The genitalia are figured by Leidy (1. c). The St. Augustine form examined 

 by me has a similar arrangement of the organs. I doubt not, therefore, that 

 Leidy's figure was drawn from the true auriculata. The penis sac is long, taper- 

 incr above, where it receives both vas deferens and retractor muscle ; the genital 

 bladder is elongate ovate, on a short, narrow duct. 



Polygyra uvulifera, Shuttleworth. 



Shell rimately perforated, flat above, inflated below, striated, reddish horn- 

 color or brownish, rather solid, shining ; whorls 5, slowly increasing, narrow, 



