MEMOIKS OF THE NATIONAL ACADEMY OF SCIENCES. 221 



Upon inspecting the pelves we find them forming two groups. In the one group are Nos. 

 II. 6, H. 7, H. 14, H. 18, H. 19, H. 25, H. 41, and H. 72. These present all the ordinary character- 

 istics of the male pelvis. In the other group we find Nos. H. 1, H. 5, H. 8, H. 10, H. 15, H. 30, H. 

 39, H. 45, H. 57, and H. 59. These represent females. 



No. H. 90 is the pelvis of a very young person. The ilia, iscliia, and pubes are not coossin'ed. 

 Hence, we do not attempt to determine its sex, and omit it from our calculations. 



The data furnished by the breadth-height index and the index of the superior strait accord to 

 the Saladoans a high place in the human series. With regard to the breadth-height index, both 

 the males and the females stand at the top of the scale. With regard to the index of the superior 

 strait, the females stand at the highest (arithmetically the lowest) end of the scale above the 

 Europeans. The males occupy a medium position. 



The other indices are of use in comparing the sexes, but we have never seen any comparative 

 data concerning them in print. 



We have prepared four ordinations, one for each index. These, especially the indices of 

 pubo-ischiatic depth and that of sacral length, show very prettily the natural grouping of the sexes. 

 (See Tables LXII to LXV, inclusive.) 



X( >TE. Iii the table of measurements t of the pelvis the abbreviation " 5 v" is occasionally found 

 after figures concerning the sacrum. This is used in cases where the sacrum consists of six verte- 

 bra^ to indicate that only five of them are measured. 



LIST OF MEASUREMENTS. 



1. Conjugata externa. Antero-posterior maximum diameter of the pelvis: From the antero- 

 superior part of the symphysis pubis to the summit of the spinous process of the first sacral 

 vertebra. 



2. Crest ividth. Width between the crests of the ilia : Indicated by the greatest width between 

 the external surfaces of the crests. 



3. Antero-mperior spinal ividth. Width between the anterior-superior spines of the ilia: From 

 the center of the most prominent part of one spine to the corresponding point on the other.. 



-1. Postero-mperior spinal width. Width between the posterior- superior spines of the ilia: 

 Measuring from the center of the most prominent part of one posterior- superior spine to a similar 

 point on the other. 



5. Antero-posterior diameter of the brim. From the anterior-superior margin of the promontory 

 of the sacrum to the most adjacent point of the symphysis pubis. 



6. Transverse diameter of the brim. Maximum width measured at right angles to the antero- 

 posterior diameter. 



7. Antero-posterior diameter of outlet. Width between the center of the anterior-inferior 

 margin of the body of the fifth sacral vertebra and the most adjacent point of the symphysis pnbis. 



8. Transverse diameter of outlet. The maximum width of the pelvic outlet measured at right 

 angles to the antero-posterior diameters of the outlet, between the most widely separated points, 

 on lines passing parallel to the brim line from the spines of the ischia to the lower ends of the 

 obturator foramina. 



9. Sciatic width. Minimum distance between the sciatic spines. 



10. Pelvic height. Maximum length of the innominate bone or pelvic height. 



11. Iliac breadth. Maximum breadth of the ilium. 



12. Heir/Jit of iliac fossa. Height of the internal iliac fossa from the superior strait to the most 

 elevated point of the iliac crest. (Upon the superior strait Verneau's point de repere is situated at 

 the middle of the distance which separates the sacro-iliac articulation from the point which cor- 

 responds to the maximum transverse diameter of the strait.) 



13. Cord of the brim. From the sacro-iliac articulation to the symphysis pubis (at the level 

 of the superior strait). 



14. Pubo-ischiatic depth. The distance between the upper surface of the pubis and the lower 

 surface of the ischium, from the smooth level surface on the pubic side of the ilio pectineal suture 

 above to the lowest part of the tuber ischii. 



