SEA-FISHERIES LABORATORY. 



337 



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. 



-- / 



Fig. 8. — Diagrammatic section through the integument of a hard crab. 



f. = basement membrane. 



g. = dermis. 



h. = duct of the cutaneous gland. 

 k. = muscle attached to the base- 

 ment membrane. 



cutaneous gland. 



a. = cuticle. 



b. = pigmented layer. 



c. = calcified layer. 



d. = non-calcified layer. 



e. — epidermis. 



I. 



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 layer of pigment cells close to the basement membrane. 



