338 Proceedings of the Royal Physical Society. 



however, the fossil considerably exceeded the recent mandible, 

 and obviously belonged to a much larger animal. 



The left humerus of Bos primigeniiis was perfect, except 

 that the two tuberosities were injured. Its length from the 

 head to the radial articular surface was 15f in. ; the breadth 

 at the condyles was 5J in. It was a more massive bone 

 than the right humerus of the same species described by 

 me in 1859. The right tibia was perfect, and a massive 

 bone; its extreme length was 19J in.; the greatest breadth 

 at the upper end was o^V ii^- ; at the lower end, 3^ in. 

 The right metatarsal bone was perfect; its extreme length 

 was 12J in.; its breadth at the upper end, 2f in.; at the 

 lower end, 3yV in. These long bones were not rubbed, but 

 their muscular ridges and articular surfaces were sharp and 

 well defined as in a recent bone ; their dimensions, however, 

 were considerably greater than in the skeleton of the 

 Hamilton wild white ox. I have not thought it necessary 

 to give the precise dimensions of the corresponding limb 

 bones in the Hamilton ox, as their measurements have 

 already been recorded by Dr John Alexander Smith in his 

 "Notes," above referred to, p. 616. 



Appendix on the Geology of the Silloth Dock. 



By Hugh Miller, Esq., F.G.S., H.M. Geological Survey. 



I visited the New Dock at Silloth, and examined the section, 

 during the progress of the excavations in March 1884, about 

 two months after the discovery of the skull of Bos primi- 

 geiiius. A year later, when there was some prospect of my 

 notes being brought into requisition, I had occasion to revisit 

 Silloth, and confirmed some important particulars in which 

 my account differs from that of previous observers. On 

 both occasions I was much indebted to the courtesy of 

 Mr J. T. Middleton, C.E. ; and in March last to that of 

 Dr Leitch, the President of the Silloth and Holme Cultram 

 Literary and Scientific Society, to whose paper, " Notes on 

 the Geological Formation and Fossils of tlie Silloth New 



