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Show 2 MR. A. H. GARROD ON THE [Jail. 2, 3. Two Orange-headed Ground-Thrushes (Geocichla citrina), two White-throated Laughing Thrushes (Garrulax albogularis), and one Horsfield's Whistling Thrush (Myiophoneus horsf eldi), from India, being likewise all representatives of species new to the Society's collection. 4. Two Black-headed Partridges (Caccabis melanocephala) and one Hey's Partridge (Caccabis heyi) from Hedyar near Mecca. Presented by Commander F. M . Burke, December 30th. The birds of Arabia are so little known to us that we are always glad to receive specimens from that coast. Of the large black-headed Caccabis (see P.Z.S. 1837, p. 818) we have only once before received a living specimen. Professor Newton exhibited a variety of the Guillemot (Alca troile) remarking:-"The specimen on the table has been kindly lent me by Mr. T. M . Pike, of Wareham, who shot it on the 29th of November last, at sea, between Poole and Christchurch. It is the first example I have seen of the curious variety briefly described by Dr. Kriiper ('Naumannia,' 1857, p. 437), on the authority of Pastor Jon Jonsson, who saw one which had been taken, in July 1848, at Grimsev, off the north coast of Iceland, and seems to agree in all respects with the bird so described. It differs strikingly from the normal appearance of the species in the colour of the bill and legs, which, as will be seen, are of a bright yellow, while the claws are white. This last fact points, I think, to the variation originating from the cause which produces albinism in so many animals. Further than this I will only call your attention to a somewhat similar variety of Pica rustica, seen, though not obtained, by Mr. Harvie Brown in Scotland some years since (Zool. 1867, pp. 706, 757, 826, 877, 913), and again in Devonshire by Mr. G. F. Mathew (torn. cit. p. 1016), in which the bill was yellow-as well as to the yellow colouring of the bill occasionally found in examples of the variety of the Northern Diver which has been described under the name of Colymbus adamsi. The following papers were read :- 1. Notes on the Visceral Anatomy and Osteology of the Ruminants, with a Suggestion regarding a Method of expressing the Relations of Species by means of Formulae. By A. H . G A R R O D , M.A., Prosector to the Society. [Received January 2, 1877.] There is so little known of the differences in the visceral anatomy of the many genera and species of the ruminating animals, that I feel that no apology is necessary for bringing before this Society the facts which my prosectorial opportunities afford me with reference to parts which are either too large or too perishable to be easily preserved in our museums. The following " Notes " will be found to |