FAMILY C0L1MACEA. 93 



1. Zua subcylindrica. Subcylindrical Zua. 



Shell ; cylindrically oblong, imperforate, very transparent, smooth, 



shining, horny, spire obtuse, whorls five to five 



and a half, convex, the last rather produced ; 



aperture rather small, lip simple, opakely cal- 

 lous, left margin obsoletely truncated at the 



end. 

 Helix subcylindrica, Linnseus (1767), Syst. Nat. 12th 



edit. p. 1248 (not of Montagu). 

 Helix lubrica, Miiller (1774), Verm. Hist, part 2. p. 104. 

 Turbo glaber, Da Costa (1778), Test. Brit. p. 87. pi. v. 



f. 18. 

 Bulimus lubricus, Bruguiere (1789), Enc. Meth. Vers. vol. i. p. 311. 

 Lymncea lubrica, Fleming (1814), Edin. Encyc. vol. vii. part 1. p. 78. 

 Cochlicopa lubrica, Eisso (1826), Hist. Nat. Europ. Merid. vol. iv. p. 80. 

 Cionella lubrica, Jeffreys (4830), Trans. Linn. Soc. vol. xvi. p. 347. 

 Achatina lubrica, Menke (1830), Syn. Moll. p. 29. 

 Zua lubrica, Leach (1831), Brit. Moll. p. 114. 

 Columna lubricus, Cristofori and Jan (1832), Cat. n. 6. 

 Styloides lubricus, Fitzinger (1833), Syst. Yerz. p. 105. 

 Achatina subcylindrica, Deshayes (1839), Anton, Yerz. Conch, p. 44. 

 Zua Boissii, Dupuy (1850), Hist. Moll. vol. iv. p. 332. pi. xv. f. 9. 

 Bulimus (Cochlicopa) subcylindricus, Moquin-Tandon (1855), Hist. Moll. 



vol. ii. p. 304. pi. xxii. f. 15 to 19. 

 Ferussacia subcylindrica, Bourguignat (1856), Amen. Malac. vol. i. p. 209. 

 Hob. Throughout Europe. Northern and Central Asia. North Africa. 



Madeira. United States. (Under stones, logs, and leaves, both in wet 



and dry places.) 



Zua subcylindrica has of all our land mollusks the most extended 

 distribution in height and in space, being found both in wet and 

 dry places, on low ground as well as at a considerable elevation on 

 the mountain side. It occurs throughout Europe, in Central and 

 Western Asia, from the Amoor to Cashmere and Thibet, and in 

 North America it is found in the north-western State of Ohio, in 

 the Middle United States, and in all the States of New England. 

 " On visiting Oak Island, Chelsea," says Dr. Grould in his ' Report 

 of the Invertebrata of Massachusetts,' "I found the surface of the 

 ground covered with these shells in incalculable numbers. Hundreds 

 might be taken up clinging to a single fallen leaf; as the moisture 

 evaporated they all disappeared beneath the leaves." 



The shell, which is not umbilicated, is composed of five whorls, 



