ARREST OF DEVELOPMENT. 41 



the intermaxillaries, which are separated by a fissure on 

 either side from the maxillae. 



Presented by Sir W. Fergusson, Bart., 1865. 



146. A portion of the skull of a new-born child, with considerable 



divergence of the pterygoid process and palate-bones. 

 There is entire deficiency of the bony palate, and the 

 maxillae are widely separated from each other and from 

 the premaxillaries. Presented by Sir W. Fergusson, Bart. 



147. A portion of an adult skull in which there is a cleft nearly 



an inch wide between the lateral halves of the bony 

 palate. The vomer is bent over to the left side, and is 

 united to the left half of the palate. The alveoli are very 

 defective. There are only two teeth on the left side. 



Presented by Sir W. Fergusson, Bart. 



148. The intermaxillary bones from eight cases of cleft palate 



in infants. Presented by Sir W. Fergusson, Bart. 



149. The intermaxillary bones from two cases of cleft palate in 



children. Presented by Sir W. Fergusson, Bart. 



150. The intermaxillary bones from a case of cleft palate in an 



adult. Presented by Sir W. Fergusson, Bart. 



151. A dissection of the tensor and levator palati muscles and 



the neighbouring parts in a case of cleft palate in the 



adult. 



The soft palate only -is apparently cleft in this case, but the 

 bones are implicated slightly, although to a much less extent than 

 in the foregoing preparations. The preparation is of special in- 

 terest because it shows the manner in which the levator palati and 

 palato-pharyngei muscles keep the edges of the soft palate apart. 

 The upper fibres of the superior constrictor, which act as their 

 antagonist, are unusually well developed. This is the original 

 dissection on which Sir W. Fergusson founded his operation of 

 Staphylorophy, which consists in dividing the fibres of the levator 

 palati, palato-pharyngei, and palato-glossi. The preparation is 

 minutely described in his original description of the operation, 

 published in 1845, 'Trans. Med.-Chir. Soc.' vol. xviii. p. 273-301. 

 Presented by Sir W. Fergusson, Bart. 



152. The head of a young Lion born in the Zoological Gardens, 



March 1862, with cleft palate and arrested growth of the 

 septum narium. The litter consisted of two, this and 

 another in the same condition. The alveoli of both jaws 



