264 



ADOLF H. SCHULTZ 



TABLE 2 



Inlcrorhital breadth and interorhital index on adult skulls ivith the abnormal suture 

 or fissure on the frontal bone 



breadth; the technique of these measurements may be found in 

 Schwalbe's studies on Pithecanthropus erectus ('99). In this 

 same work are pubhshed similar measurements of a considerable 

 number of normal skulls of most heterogeneous races. Accord- 

 ing to these measurements, the interorbital breadth varies be- 

 tween 18 and 31 mm. with an average of 24.2 mm., the inter- 

 orbital index lies between 20 and 30.1 with an average of 

 24.3. A comparison of these figures with table 2 shows that 

 both the absolute and relative interorbital breadths of skulls 

 showing remnants of a metopical fontanelle are much above the 

 average. 



For the determination of the relative frequency of the anomaly 

 in the two sexes, the material at our disposal has been much en- 

 larged through the published cases of transverse fissures in the 

 frontal bone of children and newborns. In Schwalbe's cases 

 sex is stated in 9 juvenile and in 5 adult; all were male except one 

 newborn. Fischer found in 1 newborn and in 7 adults, in which 

 sex was known, that the female sex was represented twice. 



