Adams, C.B. 1842. Fresh-water and land shells of Vermont. [in] Thompson, History of Vermont (1): 151-169.
C.B. Adams, 1842. [in] Thompson, History of Vermont (1): ??.
C.B. Adams, 1847. Cat. Gen. Sp. Adams: 15.
(misidentified reference to Cyclas calyculata Draparnaud, 1806; renamed Cyclas pellucida Stimpson, 1851)

C.B. Adams, 1842. [in] Thompson, History of Vermont (1): 16.
(intro'd as intra-sp. of Symphynota compressa Lea, 1829)
Type(s): LECTOTYPE MCZ_154361 (by R.I. Johnson, 1956: 130), small brook in Middlebury, Vermont.