124 



F. H. STEWART. 



The wall (PI. 7, fig. G,d.) is continaoas with the epitlielium 



of the ductus and rectum, and with the epidermis in the 



ventral line. It consists of protoplasm, which shows a circular 



striatiou as if it might fulfil a muscular function. Nuclei are 



Text-fig. 1. Text-fig.2. 



-Rect. 



sh gr- 



fairly nnraeroiis. Cells from the dorsal and the two lateral 

 lines extend inward through the body-space towards the 

 cloaca and form a layer of cubical epithelium on its dorsal 

 wall, the cloacal ganglion (ibid., cl., ag.). There is a ciiticular 

 lining continuous with the external cuticle. 



The accessory sexual apparatus consists of the two spicules 



