The Descent of Man

said to occur in about one out of sixty human
subjects. (49. See also Prof. Macalister in 'Proceedings,
Royal Irish Academy,' vol. x. 1868, p.
124.) Again, this man had "a special abductor of
the metatarsal bone of the fifth digit, such as
Professor Huxley and Mr. Flower have shewn
to exist uniformly in the higher and lower
apes." I will give only two additional cases; the
acromio-basilar muscle is found in all mammals
below man, and seems to be correlated
with a quadrupedal gait, (50. Mr. Champneys
in 'Journal of Anatomy and Physiology,' Nov.
1871, p. 178.) and it occurs in about one out of
sixty human subjects. In the lower extremities
Mr. Bradley (51. Ibid. May 1872, p. 421.) found
an abductor ossis metatarsi quinti in both feet
of man; this muscle had not up to that time
been recorded in mankind, but is always present
in the anthropomorphous apes. The muscles
of the hands and arms—parts which are so
eminently characteristic of man—are extremely
liable to vary, so as to resemble the correspond-