References
- Comp. A. Adams in Ann. & Mag. N. Hist. 1860 vi 113 113 ser. 2.and ibid. xii. 1863, pl. vii. figs. 11, 12
- 1857 . Comp. Claparède in Müller's ‘Archiv’ , : 139 – 139 . and Moquin-Tandon in ‘Hist. Nat. des mollusq. fluv. et terr. de la France,’ ii. p. 522