エゾボラ科の貝殼に表はれた雌雄性 Sexual dimorphism in some species of Buccinidae
As already known, sexual dimorphism is seen in the shell of the members of Buccinidae (Morse 1877 ; Buccinum undatum). In the materials collected in Hokkaido and north-eastern part of Honsyu (Neptunea, Buccinum, Japelion), the difference is as follows : (1) the male shell is smaller in size, or more slender than in female shell, and also in the genus Neptunea (N. vinosa (Dall), constricta (Dall), lyrata (Gmelin)) the peristome of the female is expanded and more or less reversed, while in male no such expansion of peristome is not observed. Also in both N. vinosa and Buccinum leucostoma (Lischke) the interior of the peristome in male is characterised by the reddish orange colour, while in female it is whitish or yellowish.
ヴヰナス 11(2-3), 87-94, 1941