POLYGYRA. 267 



Helix Posielliana, BLAXD, Ann. N. Y. Lye., VII. 35, Fig. (1858). W. G. 



BINNEY, L. & Fr.-W. Sh., I. 89 (1869). 

 Dcedalochila Postdliana, TKYON, Am. Jcmrn. Conch., III. 156 (1867). 



Georgia, in Wayne County, and on the sea islands of Georgia and South 

 Carolina ; Baldwin, Florida. Not noticed out of the Southern Kegion, and 

 probably a species of the Florida Subregion. 



It is smaller than auriculata, and the rib-like stride which cover the whole of 

 that shell are scarcely developed at the base. The form of the parietal pro- 

 cess is very like that of uvulifera, but the continuation of its inferior angle to 

 the inner termination of the peristome is not prostrate, as in that species, but 

 erect, as in auriculala. The position and form of the upper tooth on the peri- 

 stome is much the same as in that species and in uvulifera, but the lower one 

 is entirely different. In those it is an oblique, strongly developed, convex, sin- 

 uous fold on the margin of the peristome, not descending into the aperture, 

 there being within a slight thickening only, corresponding with the lower exte- 

 rior apertural depression. In Postelliana there is at the base of the peristome 

 a thin, erect, oblong, lamelliforni tooth, rather oblique, but more closely margi- 

 nal than the fold in the other species. The exterior of this tooth is convex, 

 within concave; it is 1 mill, in height, and 1| in length, and descends rapidly 

 into the aperture, where it is recurved, and terminates obtusely opposite to the 

 lower end of the superior tooth, there being a very distinct and tortuous sinus 

 between the two. In opening specimens from different localities, these char- 

 acters are found to be constant. 



Jaw, as usual in the genus, with over 12 ribs. 



Lingual membrane with 21 1 21 teeth. The marginals, as in auriformis 

 ('! v -)> bave their inner cutting point simple, not bifid, even the very last at 

 the outer edge. (PI. VI. Fig. N.) 



Genitalia as in P. auriculata. 



Polygyra espiloca, RAVENEL. 



Shell rimately perforate, above slightly convex, beneath convex, striated, 

 reddish horn-color, thin, with very short hairs; spire scarcely elevated; whorls 

 5, rather convex, the last deflected and turned outwards from the 

 preceding one, scrobiculate, constricted, grooved within the um- 

 bilical region ; aperture very oblique, subreniform, contracted ; peri- 

 stome acute, continuous, the margins joined by a lamella, excavated 

 above, and produced into a tongue-shaped tooth ; the right margin 

 having a broad hooked lamella, and the base an erect lamelliforni 

 tooth produced into and recurved within the aperture. Greater 

 diameter 9, lesser 8 mill. ; height, 4 mill. 



Helix aqnloca, RAVENEL, MS., BI.AXD, Ann. N. Y. Lye., VII. 115 

 PI. IV. Figs. 1, 2.- W. <;. BIXXKY, I, & Fr.-W. Sh., II. 91 (1869)'. 

 . Dccdalochila espiloca, TKYON, Am. Journ. Couch., III. 156 (1867). 



