The Usambara Mountains in northern Tanganyika are fairly rich in species of Gulella, and I found 22 species during under a year’s stay at Amani. Five of these belonged to the section Primigulella, perhaps the only section worth a name on conchological characters alone. The determination of these 22 species has proved very difficult and the majority must remain undetermined until further work has been carried out by the several authorities to whom specimens have been sent. It is a disturbing fact that one gets different determinations back from different authorities even in the case of the larger species! Even some of the commonest species appear to be new. This paper deals chiefly with species about which no doubt exists as to their names.