Tubules of digestive diverticula in five species of Neogastropoda, one species of Cephalaspidea, one species of Aplysiomorpha, two species of Nudibranchia and one species of Basommatophora were observed by means of the tissue preparations by Azan staining. Tubules of Neogastropoda show the dichotomous branching type. Tubules of Cephalaspidea, Aplysiomorpha, Nudibranchia and Basommatophora show the monopodial branching type.