Reference

K. Tomiyama, K. Miyashita (1992): Achatina fulica (Ferussac) / Variation of Egg Clutches in the Giant African Snail, Achatina fulica (Ferussac) (Stylommatophora: Achatinidae) in Ogasawara Islands – Venus: jap. Journ, malacology – 51, No.: 293 - 301.