Additional notes on Gulella (Gastropoda Pulmonata: Streptaxidae) from the Aldabra group, western Indian Ocean

The availability of new material and reconsideration of types and other specimens has necessitated the publication of the following notes, Acknowledgements are due to Drs. P.B. Mordan of the Mollusca Section, British Museum (Natural History), London (abbreviated BM), and S. Tillier, Laboratoire de Biologie des Invertébrés Marins et de Malacologie, Museum National d’Histoire Naturelle, Paris, for access to material, and to Dr. A.A. Shileyko, Zoological Museum of Moscow State University, Moscow, for depositing some valuable specimens in the Leiden museum. The abbreviation l/d stands for the ratio length/major diameter of shells; this has been calculated from micrometer readings, so that the figures do not always agree with those calculated from the measurements in mm.