D.V 



DerEpthm 



B 



M.Pl 



V.Nv.Cd Cosl.Epknm. 



i 







FIG. 7 2 - 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. 69, C. 



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

 muscle-plates (M. PI), and parietal layer of ccelomic epithelium (C&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 ccelomic epithelium (Ccel. 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) 



