Original Combination:

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Original Description:

Similar to V. indentata, but differing from that species in the distinct umbilicus, about one-half mm. wide, showing the penultimate whorl within ; radial grooves more numerous, and therefore closer. The same characters, and the smaller size, separate rhoadsi from V.carolinesis. Alt. 2.5. diam. 4.8mm. or somewhat smaller. Distribution, mainly along the Blue Ridge and for some distance each side of it, and south to the Great Smokies. It is lacking, so far as we know, in New York, Ohio, the whole trans- Alleghenian region and the Gulf States, where V. indentata is of common occurrence. Special localities are as follows : Connecticut: W. Granby. Hartford County (Benton Holeomb). New Jersey : White Pond. Warren County ( Pilsbry & Rhoads, type locality). Pennsylvania : Top of High Knob, Pike County (S. N. Rhoads) ; Philadelphia (Tryon) ; Monterey, Adams County (Pilsbry) : Fulton County (C. W. Johnson ). Maryland : Cumberland (Howard Shriver). West Virginia : Wirt County (William J. Fox). North Carolina: Roandale Farm." near Magnetic City (A. G. Wetherby). Tennessee: Roe's Flat. Cade's Cove, in the Great Smoky Mountains (James H. Ferriss). This Vitrea seems to be especially characteristic of the somewhat mountainous northern portion of New Jersey and Pennsylvania traversed by the Blue Ridge. It often occurs associated with typical V. indentata, from which it is perfectly easy to separate it by the well-marked umbilicus. The series before me shows constantly the differences mentioned above, with no intergradation whatever, even when rhoadsi occurs with indentatus. It is named in honor of Mr. S. N. Rhoads. who collected the types with the writer. Mr. Rhoads found it also in Pike County, Pennsylvania. Probably the “variety with an open umbilicus” which Mr. Binncy mentions without locality under Z. indentatus (Manual of American Land Shells, Bull. U. S. Nat. Mus. No. 28, p. 63, p. 17) is this form. Collectors who will look through their series of V. identata and V. hammonis from the region indicated above will probably find specimens of V.rhoadsi. It is much easier to separate from indentata, than carolinesis is.