16 
THE VOYAGE OF H.M.S. CHALLENGER. 
of the iliac length. The mean ischio-innominate index in the males was 44, in the 
females 45. In each pelvis the breadth of the sacrum exceeded the length, with the 
exception of one of the females. The mean sacral index of the four males was 114, 
of the two females 99. 
Andaman Islanders. — Table IV. Plate II. 
The specimens under examination consisted of one adult male, two adult females, a 
young male and a young female, all in the University Anatomical Museum, and presented 
by Drs. Joseph Dougal, J. S. Forrester, and D. D. Cunningham, and an adult female in the 
Museum of the Royal College of Surgeons, Edinburgh, presented by Dr. E. S. Brander. 
The following description is drawn up from the adult pelves, the general dimen- 
sions of which were small, and in relation to the short stature and generally 
small proportions of the race, but the pelvic bones were substantial, not trans- 
lucent in the iliac fossae, and the alse were expanded. In the three females the 
breadth of the pelvis varied from 196 to 235 mm., with a mean of 214 mm.; in 
height they ranged from 157 to 166, with a mean of 162 mm. The mean breadth- 
height index was 76. In the adult male the proportion of height to breadth w^as 
somewhat smaller, and the mean index was 75. In both the females and the adult male 
the breadth between the antero-superior iliac spines was between two and three times 
greater than between the postero-superior iliac spines. The greatest diameter of the 
cotyloid in the two sexes ranged from 42 to 47 mm. The mean vertical diameter of the 
obturator foramen in the females was 42 mm.; the mean transverse diameter was 30 mm.; 
the mean obturator index of the females was 72, the index of the onl}^ adult male was 70. 
The subpubic angle ranged in the female from 81° to 88°, in the male it was only 68°. 
In both the adult male and females the pelvic brim inclined to the cuneiform 
shape, though in the females, owing to the greater transverse diameter of the brim, the 
form was more rounded than in the male. In the females the transverse diameter ranged 
from 106 to 117 mm., with a mean of 111 ; in the male the transverse diameter was 
102 mm. In the females the conjugate diameter ranged from 92 to 100 mm., and the 
mean was 97 ; in the male this diameter was 99 mm. The mean pelvic or brim index 
in the adult females was 87, the same index in the male was 97, and in both the young 
male and young female the transverse and conjugate diameters were so nearly equal that 
their mean pelvic index was 100. In the male the intertuberal diameter was much 
less than the transverse diameter of the brim, but in the females and young specimens it 
closely approached it in the same pelvis. The mean inferior sagittal diameter in the 
females was 109 mm., which was considerably above the mean conjugate, but in the 
male the inferior sagittal diameter was less than the conjugate. 
The pubic symphysis ranged in depth from 27 to 39 mm. In the adult females the 
