481 



2728. A section of the cranium of a young Elephant, exposing the meatus auditorius 

 externus, membrana tympani, tympanum, and beginning of the eustachian 

 tube, with some of the surrounding air-cells. The otosteals are shown in situ. 

 The basioccipital and exoccipital have not yet coalesced. 



This specimen is the original of the figure in the ' Lectures on Comparative Anatomy,' by 

 Sir Everard Home, V.P.R.S., vol. iv. tab. xcviii., and it is noticed hi the 'Croonian Lecture,' 

 by the same author, in the ' Philosophical Transactions,' vol. xc. p. 4. 



Hunterian. 



2729. The otosteals, or ossicula auditus, of an Elephant, three years old. 



Purchased. 



2730. A transverse section of the left os humeri of a young Elephant. 



It shows the thickness of the compact walls and the delicate filamentary cancellous struc- 

 ture which occupies the centre of this part of the shaft. 



Hunterian. 



2731. The upper part of the left radius, longitudinally bisected, of a young 

 Elephant. 



The epiphysis has coalesced with the shaft. 



Hunterian. 



2732. A transverse section from the middle of the shaft of the same radius. 



Hunterian. 



2733. The lower half of the same radius, including the still ununited epiphysis, 

 longitudinally bisected. Hunterian. 



2734. Five transverse sections of the left ulna of a young Elephant. 



The central filamentary cancellous structure is very delicate, resembling fine lace-work : it 

 appears to have been removed from one of the sections. 



Hunterian. 



2735. The upper half of the diaphysis of the left femur of a young Elephant, from 

 which a longitudinal section has been removed. 



It shows the progressive increase of the compact outer wall as the shaft descends and 

 diminishes, and the delicate reticulate cancellous structure which occupies the whole of the 

 included space, save that where the parietes are left entire at the lower end of the section, 

 and where a small medullary cavity is exposed, into which the canal for the medullary artery 

 opens after a short course from behind forwards and downwards. 



Hunterian. 



3Q 



