Abstract
Batillaria flectosiphonata n. sp. is described from the Iriomote Island, the Nansei Islands, Japan. It is the fifth species known of the genus Batillaria (Gastropoda : Batillariidae) in the Indo-Western Pacific. It differs from all of the Japanese species of Batillaria, B. zonalis, B. multiformis and B. cummingi by having a distorted and deeply concave collumella and a siphonal canal which is reflected to the left. In the features of collumella and siphon, it resembles Batillaria solida (Gmelin), but differs from the latter species in having more slender and thinner shell with distinct axial ribs, and also by having radular ribbon with different-shaped lateral tooth.
