'266 A MANUAL OF AMERKAN LAND SHELLS. 



POLVGYRA. (See below.) 

 Polyg'ys'a Iciiorina, Gould. 



Shell with a partially covered umbilicus, depressed, orbicular, tliin, 

 fk:. 2S4.* reddish horn-color, delicately striated, and, when fresh, hav- 

 ing a delicate down on its surface; spire depressed, composed 

 of five slightly convex whorls, the last of which is obtusely 

 angular at its upper portion ; base convex, excavated at the 

 p.ieporina. uiubilical rcgiou, with a miuute, partially covered umbilicus; 

 aperture oblique, lunate; peristome incumbent, rose-colored, reflexed, 

 bearing on its dilated basal edge two expanded teeth, separated by a 

 deep, narrow fissure, its terminations joined by a quadiate, erect, 

 oblique lamella, whose upper edge is joined to the upper angle of the 

 aperture by a thread-like callus ; an 'internal, fulcrum-like tubercle, 

 with uneven outer edge, on the base of the shell. Great diameter 6, 

 lesser 5i™'" ; height, 3™". 



Eelix leporJim, Gould, Proc. Bost. Soc, iii, T.O (1848) ; in Terr. Moll., ii, 199, pi. xl a, 

 fig. 1. — Eeeve, Con. Icon., 722 (18r)2). — Blaxd, Ann. N. Y. Lyc.,vi, 348 

 (TsoS).— W. G. BiNNEY,T.M.,lv,92; L. &Fr.-W. Sh., 1, 111 (1869).— Pfeif- 

 FK.K, Mon. Hel. Viv., iv, 320, no descr. . 



Helix pustula, Pfeiffer, Mou. Hel. Viv., i, 70, descr. ; var. (3] iii, 268, not of Ferus- 



SAC. 

 DcedaloehUa Jepor'nia, 1'rtox, Am. Journ. Cnnch., iii, 61 (1867). 

 Pohidiira Irporina, W. G. Binney, T. M., v, Lt'8.. 



Indiana; Illinois; Arkansas; Mississippi; Marengo County, Ala- 

 bama; Georgia; Texas. A species of the Southern Eegion, ranging 

 quite into the Interior Eegion. 



P. leporina is larger th^n ]^ustid a , less elevated, the whorls are less 

 convex, the incremental stri£e less numerous and distinct, and the 

 aperture is wider. The umbilicus is more nearlj' covered by the peris- 

 tome, and is without the groove which prevails in pvsttda. Within and 

 near the aperture there is what may be called thefalcrum, extending 

 from the floor of the last to that of the penultimate whorl, aid ap- 

 proaching in character to, but less strongly developed than, that in 

 Stenotrema monodon. The outer edge of this fulcrum is uneven, in one 

 specimen somewhat denticulated. 



Genitalia not observed. 



Jaw as usual; over 11 stout, separated ribs; a strong upper muscu- 

 lar attachment. 



Lingual membrane as usual in the genus (Terr. Moll.,V, Plate YI, 

 Fig. F).. Teeth 18-1-18, with 8 laterals. 



* The figure does not show the hirsute character of the epidermis. 



