PHERETIMA. 



115. Transverse Section. Make a drawing under the low power of the whole section 

 to show : body-wall, consisting of cuticle, epidermis with gland-cells, circular and 

 longitudinal muscle layers ; peritoneum ; mesentery ; crelom ; alimentary canal, with 

 endoderm and muscle layers ; chloragogen cells ; ventral nerve-cord showing nerve-cells 

 and nerve-fibres ; dorsal, sub-intestinal and neural blood-vessels, also networks of vessels 

 in the wall of alimentary canal and in the body-wall ; inicro-nephridia ; chaetse, with 

 muscle-bands in some sections. 



