147 



in> Lateral edge. 



r Marks of increase or growth. 



d Contraction. 



'Z. Places where the calcareous deposits from the periosteum formed in 

 layers one over the other, have separated or decorticated. 



v. Single. 

 w. Double. 

 & Insertion. 



& a. Section. 

 



ae Triangular perforated ridge. 



5 Muscular envelopment. 



Muscular elongation. 



=* Sphincter contraction. 



2 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 on a plate gives a criterion for all the 

 conformable parts. 



xx Twisting contraction produced by muscular action. 

 xxx Undulating contraction. 



