D.V 



t'u 



M.Pl 



FIG. 70. Polygordius neapolitanus. 



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 (Ctt), deric epithelium (Der. Epthm}, 

 muscle-plates (.17. /"/). and parietal layer of coelomic 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 (Ent. Epthm} 

 covered by the visceral layer of coelomic epithelium (Cal. Epthm'} : 

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

 formed of a double layer of coelomic 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} 



U 2 



