EASTERN PROVINCE SOUTHERN REGION SPECIES. 369 



Polysryra Texasiana, Moricand. 



Shell rimately perforated, depressed, orbicular, rather solid, of a pale 

 horn-color, sometimes with a revolving rufous band, with fig.403. 

 crowded rib-like striae above, smooth or faintly striated and /^ 

 shining beneath; spire nearly flat, of 5 whorls, separated by 

 a well-marked suture, the outer one obtusely angular at p- Texasiana. 

 periphery, nearly at the plane of the ppire, and somewhat deflected 

 near the aperture; beneath couvexly rounded, with a somewhat dis- 

 torted appearance in consequence of the whorl becoming narrower, 

 rather than broader, towards the aperture, leaving a minute umbilical 

 perforation; aperture very oblique, narrow lunate, the peristome form- 

 ing about two thirds of a circle, reflected, white, with a constriction 

 behind it, and armed with two denticles at its inner margin, one near 

 the centei, the other at the middle of the basal portion ; the extremities 

 of the peristome connected by a callus across the columella of an 

 acutely angular form, pointing to the middle of the portion of the peri- 

 stome above the upi^er denticle, the lower ramus of the angle being 

 longest and largest and a little concave inwardly. Greater diameter 

 10, lesser 8^"""; height, 5""". 



Helix Texasiana, Moricand, M6m. Soc. Phys. Hist. Nat. de Geneve, vi, 538, pi. i, fig. 

 2 (1833). — Deshayes, in Lamarck, vii, 133; ed. 3, iii, 316; in FlcR., i, 74, pi, 

 1. c.(excl. eyn.). — Feruss>c, Hist. dSs Moll., pi. Ixix, D,fig. 2. — Pfeiffer, 

 Mon. Hel. Viv., i, 418, excl. syn. and var /? ; Vol. v, 318.— Chemnitz, ed. 2, 

 (1846), i, 85, excl. var. and figure.— Reeve, Con. Icon., No. 707. — Binney, 

 Terr. Moll., ii, 191, pi. xlv, fig. 1.— W. G. Binney, Terr. Moll., iv, 79 ; L. & 

 Fr.-W. Sh., i, 93 (1869].— Fischer and Crosse, Moll. Mex. et Gnat., 279 

 (1870). 



Helix aiiriculala, Binney, Bost. Journ. Nat Hist., iii, 3'7. 



Helix Tamaulipasensis, 1jKA,Ftoc. Acad. Nat. Sci. Phila. , 1857, 102; Journ., — ; Ob8.,xi, 

 139, pi. xxiv, fig. 113. 



Dcedalochtla Texasiana, Tryon, Am. Journ. Conch., iii, 62 (1867). 



Polijgyra Texasiana, W. G. Binney, Terr. Moll., v, 270. 



In the Texan Subregion, in Texas and the neighboring Mexican Stat© 

 of Tamaulipas; Fort Gibson, lud. T. 



Animal brownish or dingy white; eye-peduncles darker, sheaths 

 visible by a dark line, much enlarged at tip. 



There is a variety larger, with 6 whorls and with a brown band re- 

 volving above the perijihery. 



Jaw wide, low, slightly arcuate, ends blunt, with 10 decided ribs, 

 denticulating either m-irgin. 



Lingual membrane as usual in the genus ; teeth 26-1-26, with 11 

 laterals. (Terr. Moll., V, Plate VI, Fig. G.) 

 1719— Bull. 28 1-4 



