4] 2 Mr. H. M. Drummond : Catalogue of Birds found relative rank of the groups whicli present the cases of analogy. The analogy may be more or less remote : thus the case of ana-logy (so often quoted as such), as existing between the Goat-sucker {Caprimulgus) and the Bat — members of different classes — might be regarded as an instance of analogy, say of the fifth de-gree; that of the Otters to the Beavers (animals of different orders of the same class), an analogy of the fourth degree; and that of the Beaver to the Coypu* (both Rodents), an analogy of the third degree : again, the relationship existing between the Whales and Fishes may be one of analogy of the fifth degree ; that existing between the Dugong and the Porpoise may be one of affinity or analogy ; but in either case is less remote than the re-lationship of the Cetacea to the Fishes. According to these propositions moreover, the relationship of the Lagostomus to the Marsupiata might be one of affinity of the fourth degree, whilst that of the Wombat to the Rodentia might be one of analogy of the same degree : that of the Wombat to the PhalangistidcB, an affinity of the third degree, and of the Koala to Phalangista, an affinity of the second degree; and lastly, that of Phalangista vulpina to Phalangista Cookii, of the nearest or first degree. The affinity of the Monotremata to the class Reptilia would be several degrees further removed than that of the Echidna to the Ornithorhynchus. LI. — Catalogue of the Birds found in Corfu and the other Ionian Islands, also on the coast of Albania ; from Notes made during a sojourn of four years. By H. M. Drummond, 42nd R.H. With Notes by H. E. Strickland, M.A. [This valuable paper was read to the Zoological Section at Cork, and being afterwards placed in my hands, I have ventured to ap-pend a few notes before sending it to press. When I was at Corfu in 1835 I had the pleasure of becoming acquainted with Captain Drummond, at that time I believe the only ornithologist in the Ionian Islands. He had even then formed a considerable col-lection, and the following list will show the great extent of his subsequent researches. The nomenclature is that of Temminck^s ' Manuel d^Ornithologie,' and though the names have undergone modifications from later ornithologists, yet there will be no diffi-culty in recognising the species by means of them. I have an-nexed the letter B. to those species which have also occuri'cd in Britain.— H. E. S.] * These two animals are essentially modelled upon different types of the Roden t order.