- 180 - 



1842 Helix labyrinthica Pfeiffer; Symbolae ad hist. Helle. 



II, p. 31. 

 1842 — — Adams; Vermont Mollusca, p. 160. 

 1846 - — Pfeiffer in Martini-Chemnitz Syst. Conch. 



Gab. ed. 2, p. 382, Taf. 66, Fig. 17-20. 

 1848 - — Pfeiffer; Monogr. Helic. vivent. I, p. 416. 



1850 Helix (Ulostoma) labyrinthica Albers; Heliceenp.96. 



1851 Helix labyrinthica Binney; Terr. airbreath. Moll. N. 



Am. II, p. 202, Taf. 1 7, Fig. 3, Bd. IV, p. 95. 



1852 — -- Reeve; Conch. Icon. VII, Taf. 123, 



Fig. 17—18. 



1860 Helix (Gastrodonta) labyrinthica von Martens in 



Albers Heliceen II, p. 74. 



1861 Helix labyrinthica Miles; Rep. Geol. Surv. Michi- 



gan p. 225. 



1863 — — Whitcaves; Canad. Nat. p. 24. 



1864 Strobila labyrinthica Morse; Journ. Portland Soc. 



p. 26, Fig. 64—67. 



1866 — Tryon ; Americ. Journ. Conch. II, p. 259, 



Taf. 19, Fig. 44. 



1867 Helix Morse; Americ. Nat. I, p. 145, Fig. 41— 42. 



1868 Strobila- Currier, Shell bearing Moll. Michigan p.4. 



1869 Binney; Terr. airbreath. Moll. of. N. 

 Am. in Bull. Mus. Comp. Zool. Harvard 

 Coli. IV, p. 258, Fig. 149-152. 



1869 Helix — Binney a. Bland; Land- a. Freshw. Shells 



of N. Am. I, p. 84, Fig. 150—154. 



1870 Strobila labyrinthica Gould; Rep. Invert. Mana- 



chusetts ed. II, p. 415, Fig. 676. 

 1874 — — Lewis; Bull. Buffalo. Soc. Nat. Sei. p. 131. 



1874 — Calkins; Proc. Ottava Ac. Nat. Sei, p. 21. 



1875 Patula . — Hartmann; Hist. of. Chester Connty, 



Pennsylvania, p. 449, Fig. 41. 



1876 Helix — Harper a. Weatherby; Cat. Land- a. 



Freshw. Shells of Cineinnati, 0, p. 2. 

 1878 Strobila — Binney; Terr. air-breath. Moll. U. S. 

 V, p. 259. 



