Y8 STUDIES IN COMPARATIVE ANATOMY, 



extensive and well-developed periosteal muscle," whicli " cor- 

 responds exactly in position to the similar muscle in the sheep 

 and deer."^ The muscles which pass from the upper and lower 

 eyelids to be inserted into the third eyelid are not, according to 

 Dr Watson, distinct muscles at all, but fibres of the orbicularis 

 palpebraruTYi. 



Camper, Harrison, and "Watson agree in stating that no true 

 lachrymal apparatus is present. The Harderian gland lies 

 between the inner wall of the orbit and the rectus internus ; its 

 excretory duct opens on the surface of the third eyelid. 



Eae. 

 The membrana tympani is of oval form, and looks downwards, 

 outwards, and a little forwards. The malleus is attached above 

 the centre to the apex of the shallow funnel, which, as in other 

 mammalia, projects inwards from the tympanic membrane. 

 The apex of the funnel is directed upwards and forwards. In 

 our young example the long diameter of the membrane was 

 I inch, and the short diameter ^ inch less. Sir Everard Home 

 gives ^5 i^^^ ^^ ^^^ dimension, and rather more than an inch 

 as the other, ^ This was probably from an adult animal. The 

 middle layer contains the usual radiating and circular fibres. 

 No peculiarity of importance was observed with respect to the 

 ossicles. 



Nose. 



The cartilaginous nasal septum continues forwards the plane 

 of the vomer and of the perpendicular plate of the ethmoid. 

 It ends in front by a tapering projection which extends in 

 advance of the bony nares, and supports the alinasal cartilages. 

 The cartilage of the septum is not prolonged into the fibrous 

 and muscular septum of the proboscis. Its upper edge gives 

 origin to a set of longitudinal muscular fibres, which increase in 

 number below, and ultimately blend with the under surface of 

 levator prohoscidis. The same edge gives off on each side a 

 narrow lateral process, continuous along the whole length of the 

 septum, and to these processes the alinasal cartilages are attached 



^ Described by Professor Turner in the Proc. Boyal Phys. Soc. Edinburgh, Dec 

 19, 1861, and Nat. Hist. Review, Jan. 1862, 

 2 Phil. Trans, for 1800, p. 4. 



