90 
vw. 
ww, 
z 
y & 3. Section. 
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XXX 
147 
Lateral edge. 
Marks of increase or growth. 
Contraction. 
Places where the calcareous deposits from the periosteum formed in 
layers one over the other, have separated or decorticated., 
Single. 
Double. 
Insertion. 
Triangular perforated ridge. 
Mescolar envelopment. 
Muscular elongation. 
Sphincier contraction. 
Perforated tubercle. 
Larger than natural size, the number of inscribed triangles points out 
how many times magnified ; this sign is not always used, as its 
employment in one instance ona plate gives a criterion for all- the 
conformable parts. 
Twisting contraction produced by muscular action. 
Undulating contraction. 
