434 NOTES ON SKELETON FOUND AT CISSBTJBY. 



the male may be supposed to have belonged to a somewhat younger 

 individual. In the male skeleton, again, the manubrium sterni is 

 not anchylosed to the body; but this anchylosis, as visible in the 

 female skeleton, must be considered an abnormality, explicable, 

 possibly, by some peculiarity of diet, as it does not usually super- 

 vene till advanced life. 



That the owners of the two skeletons under comparison were 

 really workers in the flint mines in which they were found, is 

 rendered probable by the markings of their long bones, of which 

 mention has already been made in the description of the female 

 skeleton (page 423). The insertion of the deltoid, a muscle greatly 

 employed in climbing, is very prominent in both humeri of the 

 male skeleton, but especially in the right ; the insertions of the 

 greater pectoral and of the latissimus dorsi, which take such a large 

 share in pulling the body after the upwardly extended and grasping 

 arms, assume, as in the gorilla, the shape of long, roughly undulated, 

 depressions ; the anterior border of the bones, from the upper end of 

 the insertion of the pectoral down to that of the deltoid, describes 

 a curve convex forward to an extent which I have not noted in 

 other human humeri, but which is very similar to that described 

 by the anterior border of the platycnemic tibiae. The musculo- 

 spiral grooves are poorly marked ; but the flat lower part of the 

 posterior surface shows much more signs of the implantation of 

 muscular fibres than is usual even in much more powerful humeri. 

 All the four ulnae of the two skeletons now before us resemble each 

 other, in having the lesser sigmoid notch for the cylindrical head 

 of the radius shallow and poorly defined, whilst the lower edge of 

 the bone describes a much more marked carinated curve, extending 

 over a distance of % \ inches by 3 \ inches, from the level of that 

 notch forward, than is usual in human ulnae. These peculiarities 

 are, according to M. Broca, noticeable in certain anthropoid apes 

 (see his ' Me"moires,' torn. ii. p. 181); but like the somewhat similar 

 tibial platycnemy, they are more pronounced in the human than 

 the simian bones. 



Setting aside the sexual disparity, which is so often observable in 

 an exaggerated degree in the limb bones of uncivilised races (see 

 ( British Barrows,' p. 659, and this volume, p. 257), the lower limb 

 bones are, like the upper, curiously similar in the two skeletons, and 

 may have their similarity explained in like manner by reference to 



