484 BUMPUS. 
EXPLANATION OF PLATE C. 
The vertical lines, ordinates, indicate the several specimens from I to Ioo. 
Entire lines represent normal, broken lines represent homceotic specimens. The 
numbers at the left, in ascending order from 1 to 55, indicate the number of ver- 
tebree and the ratio of the length from the XXX to the XX, and XIX to the I 
vertebra. 
The irregular line, crossing the plate transversely from 45 on the left, repre- 
sents the length of the animals in terms of vertebra, and the more regular dotted 
line follows its mean course. 
The irregular line extending across the upper part of the plate represents the 
relative variation in the ratio of tail-length to body-length. 
The red curve, running obliquely across the plate, indicates the variation in 
absolute length, and is represented in profile on the right. The figures in red 
indicate millimeters ; thus, specimens 71 and 72 are 308 mm. in length. 
