332 The American Naturalist. [April, 
is so far posterior as to throw the femur backward when in a 
place. This requires that in order to maintain equilibrium, 
the head and body must have been thrown forward. This 
relation of the femur and tibia is what we find in the apes, 
and it is highly probable that the man of Spy presented a 
somewhat similar figure when walking. That is, the knees 
were bent and the body thrown forward. In the best preserved 
leg, the knee was also slightly bent inward. The femur had, 
however, the superior length generally characteristic of man, A 
though this, it is well known, is a variable character. l 
MM. Fraipont and Lohest have pointed out the genera 
characters of the dentition of the man of Spy. They show that 
the molars increase in size posteriorly to the same extent that 
they do in the ‘apes, which is the reverse of what is usual in 
man, where they diminish posteriorly, or, in a few lower races 
(Australians, ete.), remain equal. They show that the superior — 
molars are all quadritubercular, and that the internal root is 
distinct in all of them. Through the kindness of M. Lohest,I 
received casts and photographs of these teeth, and I give here 
figures the former (Plate IX), which are more satisfactory 
than those in the memoir from which I have already quoted 
so fully, where, indeed, the grinding faces are not represented 
at all. I also make some remarks which they suggest, on some 
details not noticed by MM. Fraipont and Lohest. ve 
The casts of the teeth of the man are those of P.m. 2 and M. | 
= of one side, and of M. *** of the other side. Those of the — 
woman are alveoli of I. * and C. +, and the entire teeth of P. 
m. ` and M. =+ all of one, the right, side. The crowns of 
the man’s teeth are moderately worn, so that their composition 
can be studied, while those of the woman are more worn, 80 
that the composition is somewhat obscure. Comprehensively, 
it may be stated that the true molars are fully quadrituber 
cular, as in the lowest known races of men, and that the 
hypocone is in the anterior molars, as large as the protocone, 
while it is always smaller in man when present. In the female 
the last superior molar has a well-developed internal root, which — 
diverges widely from the posterior external, even more widely 
than in a chimpanzee in my possession. This arrangement! 
