Ni@s 2:i] THE STUDY OF VARIATION. 457 
few specimens showed the opaque fish-hook, and thus betrayed 
the mode of their capture. 
SeEcTion I. 
(1) What is the per cent of homceotic variation in the attach- 
ment of the pelvic arch to the axial skeleton ? 
This question was considered by G. H. Parker (96), who 
based his conclusions on an examination of twenty-seven speci- 
mens, cleaned by a preparator, in none of which could the total 
number of vertebrze be determined. Of these specimens two 
were found with oblique or unsymmetrical sacra. In nineteen 
cases the sacrum was developed from the XIX vertebra and in 
six from the XX vertebra. Arranged in the form of a per cent 
table, Parker’s results were as follows: 
The pelvis is attached to the XIX vertebra in 70% of 27 specimens. 
“ “ “ “c 66 Ok XEXE “ “c 22% “OE “c 
“sc “ “ “ obliquely “cs 7% “c “ “c 
“ “ “ “c abnormally “ 29% “6 “ 
An examination of a larger number of specimens shows that 
the number of variable individuals may be considerably increased. 
On Plate C the pelvic appendages are represented by short 
lines crossing the vertical ordinates on the abscissas of the 
XVIII, XIX, and XX vertebra. 
The pelvis is attached to the XIX vertebra in 64% of 100 specimens. 
“ “ 6“ “ sc OE xX “c “ 28% “cE “cc 
“ “ “ “ obliquely “ 8% “ “ 
“ “c “ 6“ abnormally “ 36% “cS ‘“ 
The pelvis, then, is attached abnormally in 36% (28 + 8) 
of the 100 specimens. This variation should, in the light of 
the 127 specimens thus far tabulated by Parker and myself, be 
corrected by uniting the two sets of figures. This union gives 
the remarkable variation formulated in the following table, vzz., 
an average of 35%, and offers an example of excessive varia- 
tion in animals not domestic. | 
The pelvis is attached to the XIX vertebra in 65% of 127 specimens. 
CPOE SEC us, SER RD ie Uae Pa hfe a «“ 
““ “ “ “ obliquely “ 8% “6 “c 
“ “ “ “ abnormally “ 35% “6 “ 
