AMPHIOXUS 



The epidermis is only one-cell thick, as in many inverte- 

 brates. Underlying the epidermis is the mesodermal dermis, 

 which, in Amphioxus, takes the form of gelatinous connective 



■s s s 



tissue. Epidermis and dermis together form what is ordi- 

 narily known as the skin. Beneath the skin the myotomes of 

 the body are arranged in a continuous row from front to rear. 



