426 A Study of the Nasal Bridge in the Anthropoid Apes 
interracial values of </>'. It, will be seen of course that the order must be the same 
as that of the simotic index, but if we compare this table with Table XXI some 
interesting points arise as we shall show in the next section. Tables XXIV A 
and XXIV B give the means and variabilities of the maxillary and simotic angles 
cf> and <§>' . 
TABLE XXIV b. 
Simotic Nasal Angle Mean and Variability. 
Male 
Female 
Mean 
Standard 
Deviation 
Coefficient of 
Variation 
Mean 
Standard 
Deviation 
Coefficient of 
Variation 
Egyptians 
[Hylobates{$+^) 
English 
Javanese ... 
Gaboon, 1864 
Congo 
Gorillas ... 
Chimpanzees 
41-25+ -45 
9-75+ -84 
44-70+ -63 
33-23+ -88 
31-15+ -72 
26-62+ -73 
46-48 + 1-52 
22-77 + 1-37 
4-70+ -32 
4-97+ -59 
6- 58+ -44 
8-15+ -62 
7- 34+ -51 
7-6S+ -52 
10-30 ±1-07 
7 -31 ± -97 
11-40+ -78 
50-99 + 7-50] 
14-73 ±1-01 
24-54 + 1-98 
23-56 + 1-73 
28-86 + 2-10 
22-K. + 2-42 
32-10 + 4-66 
35-97 ± -57 
42-58+ -47 
28-46+ -85 
26-48 + 1-20 
45 -63 ±1-74 
20-00 ±1-73 
6- 02 ± -41 
4-96± -33 
7- 42+ -60 
8- 91+ -85 
11-23+1-23 
7-70 + 1-22 
16-73±1-16 
ll-65± -80 
26-08 + 2-24 
33-63 + 3-55 
24-61+2-85 
38-51 + 6-97 
It would appear from Tables XXE and XXII [ that ft has a greater interracial range and 
from Tables XXIV A and B that it has a greater intraracial variability than cf>. What we need 
for a good racial character is a great interracial range and a small intraracial variability. We 
cannot therefore say that <£' is a better racial character than <j). 
(11) General Classification of Nasal Bridges by <f> and <f>'*. 
We need some new terms. We propose to term races which have high values 
or low values of both (j) and </>' hornoclinic, while those which have low values of 
one and high of the other are heteroclinic. Among apes the Gorilla is markedly 
heteroclinic, and Hylobates is the same, but in the opposite direction. The 
Chimpanzee and Symphalangia are both hornoclinic and so are the English, 
Egyptians, Hindoos and Veddahs. 
Without regard to the exact numerical values and as merely descriptive terms 
the following types of Gephyrosis will indicate the nature of the characterisation, 
where it must be remembered that the reader has to fix his attention on the 
* Professor G. D. Thane has kindly made the following suggestions for a tnore complete angle 
nomenclature of the nasal bridge (see Fig. (i), p. 420) : 
Lateral simotic angle =our simotic nasal angle </>'. 
Mesial simotic angle =our 90° - </>' = angle between simotic chord and median plane. 
Simotic angle (median) =our 180° - 2c/>' = internal angle between two simotic chords. 
Lateral maxillary angle = our <j> = maxillary nasal angle. 
Maxilli-simotic angle =our 180° - <p + <p' = internal angle between simotic and maxillary chords. 
The most important point here is the maxilli-simotic- angle, the approach of which to 180°, i.e. the 
