[244] Examples will be found in Journ. Linn. Soc. Zool. xi. p. 90; Ann. Sc. Nat. xx. p. 472; Zeit. wiss. Zool. xxiv. p. 419.
[245] Herdman, Proc. Liverp. Biol. Soc. iii. p. 30.
[246] Garrett, Journ. Ac. Nat. Sc. Phil. viii. (1880).
[247] J. Bladon, Zoologist, xvi. p. 6272.
[248] Lo Bianco, MT. Zool. Stat. Neap. viii. p. 414.
[249] Animal Life, pp. 126, 135.
[250] R. Rimmer, Land and Fresh-Water Shells, p. 119.
[251] Journ. de Conch. ii. p. 245.
[252] Journ. de Conchyl. iii. p. 107.
[253] Jeffreys, Brit. Conch. iii. p. 359; Sauvage, Journ. de Conchyl. xxi. p. 122.