The Crustacea collected by Messrs. G. Gulliver and H. H. Slater amount in all to 189 specimens, representing 35 species. All of these are forms that are widely distributed throughout the Indo-Pacific or Oriental Region (which includes the eastern coast of Africa, the south and east of Asia and islands adjacent, Australia, and the islands of Polynesia), with the following exceptions:— Atergatopsis signatus (hitherto only known from the Mauritius), Caridina typus (original locality not known), Palœmon dispar (hitherto recorded only from the Malayan Archipelago), Palœmon hirtimanus (from Mauritius, Réunion, and the Indian Ocean), P. debilis (from Amboina and the Sandwich Islands), and the new species of Talitrus ( T. gulliver i), which is described below. With two exceptions all the species in the collection belong to the Podophthalmia . The following are the sub-tribes represented, with the number of species belonging to each :— The Crustacea inhabiting the Red Sea have been made the subject of special study by Rüppell and Heller, those of Madagascar and the islands adjacent by Hoffmann, of Mauritius and Réunion by Alphonse Milne-Edwards, and of the South African coast by M’Leay and Krauss. Valuable additions to our knowledge of the Crustacea of the East African coast have been published by Hilgendorf, in Van der Decken’s “Reisen in Ost-Afrika,” where will also be found a conspectus of all the known species of East African Crustacea by Von Martens. So far as I am aware, however, no species have hitherto been recorded as inhabiting the Island of Rodriguez.