1886. | Arthi opology. 749 
the case before us it is well marked and fully developed through- 
out, dividing the frontal bone into two lateral halves. The serrz 
or dentations are quite abundant for the greater part of the suture, 
and are particularly frequent in the upper portion. The coronal 
suture in the vicinity of the anterior fontanelle remains unclosed, 
permitting a slight movement of the frontal bone. 
On the sagittal suture, at its junction with the coronal suture 
(near the position of the anterior fontanelle), occurs a wormian 
bone of quadrilateral form, .65 of an inch long, by .2 of an inch 
wide. Back of this the entire sagittal suture is completely closed 
and obliterated, with the exception of a slight indication of its 
existence for about one-quarter of an inch at its junction with the 
lambdoid suture ; a shallow wavering depression along the rest 
of its former course being all that remains to mark its position. 
In the lambdoid suture, which is deeply indented, five wormian 
ones are present. With the exception of one of them, which is 
triangular in shape, situated at the summit of the occipital bone, 
by .3 of an inch. The former presents the curious feature of 
two or more wormian bones within a wormian bone. Usually 
wormian bones are of triangular form, which gives them the name 
by which they are also called, viz: Ossa triquetra, or, triangu- 
laria. In the wormian bone on the sagittal suture, the long 
diameter is with the general direction of the suture; but those 
bones in the lambdoid suture have the long diameter at right 
angles to the direction of the suture. 
ough the skull is small, it is heavy for its size; and the 
structure of the bones is solid, massive and unyielding. This is 
the more worthy of remark from certain indications which would 
seem to point to defective or abortive ossification. The occlusion 
and obliteration of the sagittal suture would appear to have found 
ve ossification, the membranous intervals left in the pro- 
oT of gs being filled in by these supernumerary bones, de- 
1l 
rance is a decidedly pronounced feature. Some of these facts 
_ Point to a similar origin. 
