47 



epidermis of the opposite side. Vitzou lias termed such 

 cells " colonnades de soutien.'' 



The cells of the epidermis are also elongated at the 

 point where the muscle fibres arise. 



k:^ 



Fig. S. — Diagrammatic section through the integument of a hard crab. 



a. = cuticle. 



b, = pigmented layer, 

 r. = calcified layer. 

 d = non-calcified layer. 

 e. — epidermis. 



I. 



f. = basement membrane. 



g. = dermis. 



h. = duct of the cutaneous gland. 

 k. =' muscle attached to the base- 

 ment membrane. 



cutaneous gland 



The dermis [g.) lies below the basement membrane, 

 and varies in thickness. It consists mainly of a network 

 of connective tissue fibres and scattered cells. There is 

 a laver oi pigment cells close to the basement membrane. 



