A. 



64 



B. 



w—ep. 



C. D. E. 



Fig. 9. — Diagrams to illustrate the histology of the structures in the 

 fracture plane before and after autotomy. (In all the diagrams 

 the proximal end of the limb is to the left). 



A. = longitudinal section through basi-ischium before autotomy, 



showing the double nature of the diaphragm. 



B. = longitudinal section through the basipodite immediately after 



autotomy. Showing the single diaphragm and the foramen. 



C. = longitudinal section through the basipodite shortly after 



autotomy. The epidermis of the diaphragm has grown over the 

 foramen. 



D. = the degeneration of the diaphragm and the formation of a new 



layer of epidermis beneath. 



E. — Formation of a thin cuticle (which is continuous with the 

 exoskeleton) by the new epidermis. 



ep. 



ep. = 



epidermis. 



exoskeleton. 



proximal part of diaphragm. 



distal part of diaphragm. 



new epidermis. 



nerve of the appendage. 

 b. = coagulated blood. 

 d. = degenerated diaphragm 

 and blood tissue. 

 cut. = new cuticle formed by the 

 new epidermis. 



