2 MR. A. H. GARROD ON THE (Jan. 2, 
3. Two Orange-headed Ground-Thrushes (Geocichla citrina), 
two White-throated Laughing Thrushes (Garrulax albogularis), 
and one Horsfield’s Whistling Thrush (Myiophoneus horsfieldi), 
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 (Alea 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. Kriper 
(«‘ Naumannia,’ 1857, p. 437), on the authority of Pastor Jon Jonsson, 
who saw one which had been taken, in July 1848, at Grimsey, 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 (tom. cit. p. 1016), in which the 
bill was yellow—as well as to the yellow colouring of the bill occa- 
sionally 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 ex- 
pressing the Relations of Species by means of Formule. 
By A. H. Garrop, 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 pre- 
served in our museums. The following “ Notes’’ will be found to 
