D.V 



Sep^ 



i t: 



Fig. •jo.—Pu/j-^^i-.i:.... ,..,.^..., ,.,.„.,.. 



A, transverse section of a male specimen to show the position of the 

 immature gonads (spy) and the precise form and arrangement of the 

 various layers represented diagrammatically in Fig. 67, c 



The body-wall consists of cuticle [Cn), deric epithelium (Der. Epthm), 

 muscle-plates {M. PI), and parietal layer of ccelomic epithelium {Ca-l. 

 Epthm). The ventral nerve cord ( V. Nv. Cd) is shown to be continu- 

 ous with the deric epithelium. 



The enteric canal consists of ciliated enteric epithelium (Enl. Epthm) 

 covered by the visceral layer of ccelomic epithelium (Cat. Epthm') : 

 connecting it with the body-wall are the dorsal and ventral mesenteries 

 formed of a double layer of ccelomic epithelium, and containing respec- 

 tively the dorsal (D. V) and ventral ( V. V) blood-vessels. 



Passing obliquely across the ccelome are the oblique muscles (0. M) 



