362 A MANUAL OF AMERICAN LAND SHELLS. 



lamellar fold and formiug a subacute augie with the basal margin, on 

 which is one broad tubercle. Greater diameter 16, lesser 13™™ ; height, 



Polygyra auriculata, Say, Nich. EncycL, 3cl Am. ed. (1819) ; Journ. Phil. Acad., i,277 

 (1818) ; BiNNEY's ed., 10.— W. G. Binney, Terr. Moll., v, 264. 



Helix auriculata, FiiRUSSAC, Hist., pi. 1, tig. 4 (1822). — Bixney, Bost. Jonrn. Nat. Hist., 

 iii,384 (ex parte), pi. xix.fig. 1 (1840), excl. syu. ; Terr. Moll., ii, 186, pi. xl, 

 fig. 1 (left baud).— Leidy, T. M. U. S., i, 255, pi. ix, figs. 5, 6 (1851), anat.— De 

 Kay, N. Y. Moll., 47, pi. iii, fig. 28 (1843).— Pfeiffer, Mod. Hel. Viv., i, 417 ; iv, 

 318, excl. var. (1853).— Chemnitz, ed. 2, 371, t. Ixv, figs. 3,4. — Desuayes, iu 

 F^R., Hist., 76 (excl. var.), pi. 1, 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 auriculaia, Tryo'!^, Am. Journ. Conch., iii, 157 (1867). 



Saint Augustine, Enterprise, Lake George, Indian Elver, and Cedar 

 Keys, 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 di- 

 ameter. Shell carried as in P. septemvolva. 



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

 larger size, the greater development of the several parts of its curious 

 aperture, and especially by the sudden outward deflexure of the cen- 

 tral part of the peristome, which has a deep scrobiculation behind it, 

 corresponding with the uj)per tooth within the aperture. The portion 

 of the parietal process extending from the inferior angle of the parie- 

 tal intruded tooth is erect, and more elevated than in any other of the 

 species. 



Jaw as usual in the subgenus ; 10 ribs. There are 26-1-26 teeth on 

 the lingual membrane. The inner cutting point of the thirteenth tooth 

 is bifid, so that there are 12 laterals. (Terr. Moll., V, Plate YI, Fig. A.) 



The genitalia are figured by Leidy [l. c). The Saint 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, tapering above, where it receives both vas def- 

 erens and retractor muscle ; the genital bladder is elongate-ovate, on a 

 short, narrow duct. 



Polygyra iivulifcra, Suuttleworth. 



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

 horn color or brownish, rather solid, shining; whorls 5, slowly increas- 



