M. T. Thorell on the Argulida. 149 struct the skull and dentition of this famous marsupial lion (Plate XL fig. 1), which, in my opinion, was not much more carnivorous than the Phalangers of the present time. I also enclose drawings of sections of Lower incisor of Thylacoleo. . . . Fiff. 2. „ „ Nototherium . . Fig. 3. „ „ Diprotodon . . Fig. 4. „ „ Thylacine .... Fig. 5. „ „ Sarcophilus . . Fig. 6. Upper incisor of Felis tigris . . Fig. 7-Lower „ „ Fig. 8. showing the relative size of the teeth in these animals, and proving sufficiently that the Thylacoleo was far inferior in strength to a modern tiger, and no match for ponderous Dipro-todons and Nototheriums. The scale of the photographed fractions is in inches, the sections are of the natural size. I remain. Gentlemen, Your most obedient Servant, Gerard Krefft, Australian Museum, Sydney. Curator and Secretary. May 24, 1866. XXVI. — On Two European Argulidse, with Remarks on the Morphology of the Argulidse and their Systematic Position, to-gether with a Review of the Species of the Family at present known. By T. Thorell*. Among the various groups which, during the last few years, have attracted the special attention of zoologists, the small Crustacean family of the Argulidse holds a prominent place. Long represented by one species only, which is common throughout a great part of Europe, and was already, before the time of Linnaeus, known as Argulus foliaceus, this remarkable family has, in the course of the last thirty years, received a sudden and unexpected acces-sion to the number of its species. Kroyerf, whose writings are the most recent upon the animals composing it, gives the number of known species as thirteen, of which eight have been described since the beginning of the year 1857, and amongst these the three species which constitute Heller's American genus Gyropeltis. Of these thirteen Argulidse, one {A. giganteus) belongs to Africa, and one only [A. foliaceus) also to Europe; the remaining eleven are all from America. * Translated, by A. O'Shaughnessy, from the GEfvers. af Kongl. Ve-tensk.-Akad. Forhandlingar, 21st series, Stockholm, 1864 (communi-cated 9th Dec. 1 863). t " Bidrag til Kundskab om Snyltekrebsene," Naturhistorisk Tidskrift, 3die R«kke, Bd. ii. (1863) p. 85.
XXVI.—On two European Argulidæ, with remarks on the morphology of the Argulidæ and their systematic position, together with a review of the species of the family at present known
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