ヤカドツノガイ

Dentalium octangulatum Donovan, 1804
ゾウゲツノガイ科. 殻長50 mm程度. 殻口は8角形. 浅虫では潮下帯泥底に生息する．
Dentaliidae. Shell length approximately 50 mm. The shell aperture is octagonal in shape. In Asamushi, this species inhabits muddy substrates in the subtidal zone.