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Show 224 MR. T. D. A. COCKERELL ON THE [Apr. 7, The genus or subgenus Gigantomilax, Bttg., was founded on a large species from the Caucasus. Lytopelte and Platytoxon are names used for a West-Asiatic group with few species, seemingly intermediate between Amalia and Agriolimax. (5) E U M I L A X , Bttg. (Paralimax, Bttg.).-Consists of species from the region of the Caucasus and Armenia, with the external appearance of Amalia and the dentition of Agriolimax, but differing obviously from both these genera in the anterior position of the respiratory orifice. I have examined specimens of Paralimax intermittens, Bttg., and Eumilax brandti, V. Mts., in the British Museum, and they seem to belong to the same genus. Eumilax, being the prior name, must be used. Parmacellince. This subfamily contains only the genus Parmacella, Cuv., which is, perhaps, the most highly specialized of all the Slugs. There are 8 supposed species, found in Western Asia, Egypt, Algeria, Morocco, Spain, Portugal, and the Canary Is. A subspecies of P. valenciennii, which I described as var. maculata, is found, together with its form olivacea, on both sides of the Straits of Gibraltar. It is interesting that the forms of P. valenciennii found at Gibraltar and Tangier should be identical; further north, in Portugal and France, the species gradually loses the dark markings on the mantle and becomes spotless. Vitrinince. Vitrina, Drp., is a testaceous genus characteristic of the Palaearctic and Nearctic regions and the Atlantic Islands. Many species have been described from South Africa and other localities, but until the soft parts of all are known, it will not be possible to say how many may be really referable to Helicarion. Other slug-like genera referred to this subfamily are Vitrinoidea, Vitrinopsis, and Vitrinoconus of Semper, from the Philippines, and Parmella, H. Ad., from the Fiji Is. Helicarionince. I have given a table of the genera of this subfamily in Ann. Mag. Nat. Hist, for Jan. 1891. Their distribution is in many ways instructive. The Urocyclus-group is very characteristic of, and confined to, the Ethiopian region. Estria and Aspidelus, from the Guinea region, are two monotypic genera which may prove identical, or at least only subgenerically distinct. Vitrinozonites from the Eastern United States, and Veliferu from Costa Rica, represent the subfamily in America. Ibycus occurs in the Himalayas, in Siam, and in Java; it also exists in Borneo, if, as I believe, the Parmarion baccarii and P. doria of Issel (which are probably two forms of the same species) are correctly referable to it. Girasia is specially characteristic of the |