SOCIETY OF THE UNIVERSITY OP ABERDEEN. 39 



may not have joined together. This theory is supported by the fact 

 that in the development of the face, if the nasal and the maxillary pro- 

 cesses do not join, polypoid projections are formed. In the pinna the 

 commonest sites of non-union of the tubercles is the position of this 

 auricular appendage, i.e., between the tragus and the crus helicis, or 

 between the helix and the antihelix. During development, the 

 tubercle forming the tragus becomes slightly constricted into three 

 tubercles lying vertically above each other. The highest can often 

 be felt in the adult ear, and it seems to me possible that over-develop- 

 ment of this could produce such an auricular appendage. 



(Signature of observer) R. W. A. SALMOND. 



