. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. rOLYGYRA. 207 Helix Postdliana, Rland, Ann. N. Y. Lye, VII. 35, Fig. (1858).—W. G. BiNNEY, L. & Sh., I. 89 (1869). Doedalochila Postdliana, Tuyon, Am. Journ. Conch., III. 156 (1867). Gcornria, in Wayne County, and on the sea islands of Georgia and South Carolina; Baldwin, Florida. Not noticed out of the Southern Region, and probably a species of the Florida Subregion. It is smaller than auriculata^ and the rib-like stria? which cover the whole of that shell are scarcely developed at the base. The f
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. rOLYGYRA. 207 Helix Postdliana, Rland, Ann. N. Y. Lye, VII. 35, Fig. (1858).—W. G. BiNNEY, L. & Sh., I. 89 (1869). Doedalochila Postdliana, Tuyon, Am. Journ. Conch., III. 156 (1867). Gcornria, in Wayne County, and on the sea islands of Georgia and South Carolina; Baldwin, Florida. Not noticed out of the Southern Region, and probably a species of the Florida Subregion. It is smaller than auriculata^ and the rib-like stria? 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 auriculata. The position and form of the upper tooth on the peri- stome is much the same as in that species and in uvuli/era, 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, lamelliform 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 ((J. v.), have their inner cutting point simple, not bifid, even the very last at the outer edge. (PI.
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