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XII. — On Cranial Deformities. — Trigonocephaltts. By W. 

 Turner, M. B. (London), E.E/.S.E. Senior Demonstrator of Ana- 

 tomy, University of Edinburgh. (Read before the British Associa- 

 tion at Bath, September 16th, 1864.) 



In the number of this Journal for January, 1864, 1 communicated 

 an article on cranial deformities, in which I discussed the influence 

 exercised on their production by the premature closure of the cranial 

 sutures. And I illustrated the effects of premature synostosis, by 

 describing and figuring several examples of a peculiarly elongated 

 and laterally compressed form of skull, termed ScaphocephaHc, the 

 characteristic shape of which was evidently due to a premature 

 closure of the sagittal suture. On this occasion, I am desirous of 

 directing attention to another very remarkable form of head, in which 

 whilst the sides of the forehead are compressed, the middle line is 

 projected forward in a beak-like manner, and which apparently owes 

 its peculiar shape to a premature closure of the frontal suture. 



The case I shall adduce in illustration of this kind of cranial de- 

 formity, the only one I have as yet met with, occurred in the person 

 of a boy, between five and six years old, the son of Irish parents.* 



When a full or three-quarter face view of the head of this child 

 was taken, the peculiar form of the frontal region was very apparent ; 



* For the opportunity of examining and obtaining photographs of this boy, I am 

 indebted to my friends. Dr. Joseph Bell and ilr. David Young. 



