AVES. 85 



Surv., Geology of Norwich, p, 54, 1881), and the specimen is 

 now in the Norwich Museum. Mr. E. E. Leach has a portion of 

 a metatarsal, from the Norwich Crag of Yarn Hill, which agrees 

 so closely with that of the Common Guillemot as to leave no 

 doubt that it belongs to this or a closely allied species. 



The Common Guillemot is now livinrr on the western coasts of 

 iiiurope, ranging as far north as Bear Island ; it is also found in 

 the Bnltic and on the coasts of North America. 



Genus MERGULUS ? Vieillot. 



Mr. R. E. Ijeach also has a part of a small avian femur from 

 Yarm Hill, which agrees very closely with the same bone in the 

 Little Auk {Mergulus alle) ; but the evidence is not sufficient to 

 justify a definite reference to that species ; it is, however, 

 provisionally referred to the above genus. 



Genus DIOMEDEA, Linnaeus. 



DiOMEDEA sp. 



{Albatross.) 



Plate IX., Figs. 2, 3. 



A right tarso-metatarsus, with a first phalangeal bone of the 

 fourth digit, from the Red Crag, was, it appears, generically 

 identified some years ago by Mr. Gerrard of the British Museum, 

 and has since been described by Mr. Lydekker (Quart. Journ. 

 Geol. Soc, Vol. XLII., p. 366, 1886). 



This tarso-metatarsus is intermediate in size between that of 

 Diomedea exulans nnd that of the smaller, D. melanophrys and 

 D. chlororhyncha ; but no specific determination has been made. 

 These bones, which are now in the Ipswich Museum, were found 

 in the sandy bed overlying the shelly Red Crag at Foxhall, and 

 are most probably of Red Crag age. 



'I'he wing bone (part of an nlna) from the Coralline Crag of 

 Orford, presented to the Museum of Practical Geology, by Colonel 

 Alexander, and alluded to by Mr. Lydekker (loc. cit.) as, perhaps, 

 belonging to the present form, I have compared with the wing 

 bones of the recent species of Diomedea and have no doubt as to 

 its belonging to the same genus. 



The Museum of Practical Geology aleo possesses a perfect ulna 

 of Diomedea, from the Pleistocene, which cannot be distinguished 

 from the ulna of D. exulans. This bone forms part of the Cotton 

 Collection of Vertebrate remains from the Brickenrth of Ilford. 



