146 Marine InvcHtigations in South Africa. Vol. V. 



behind. Each group consists of about twenty to twenty-five eye 

 spots. The brain is well developed and surrounded by a strong 

 capsule somewhat flattened dorso-ventrally. It is far removed from 

 the anterior end and is situated near the pharyngeal sac. The 

 anterior nerve cords and the nerves of the tentacles are remarkably 

 well developed. 



On the under side, which is of a dirty white colour, may be seen, 

 even with the naked eye, the mouth and the genital openings, the 

 female opening being surrounded by a fairly well-developed raised 

 wall. 



The pharyngeal apparatus is broad and short ; it is less than a 

 third of the length of the body and ends close to the male genital 

 apparatus. The pharyngeal sac, which is provided with deep lateral 

 sacs, conceals a strongly folded pharynx, the folds of which are not 

 of any great thickness. The outer mouth lies somewhat in front of 

 the middle of the body and at the commencement of the posterior 

 half of the pharyngeal sac. The gut-mouth is placed somewhat in 

 front of the outer. It leads into a spacious main gut which does 

 not project beyond the pharyngeal sac either in front or behind. 

 It gives oft" on each side six intestinal branches. The anterior 

 middle branch is rather narrow at that part which lies over the 

 brain, and beyond this it gradually becomes wider. The tree-like 

 branched intestinal canals are exceptionally wide, and are, like the 

 main intestine and pharyngeal cavity, quite filled with food material, 

 the origin of which cannot be determined. 



The I'eproductive organs occupy a relatively large space. They 

 are altogether about 7|^-8 mm. in length, or one-fifth of the total 

 length of the body. The female sexual aperture is situated 8 mm. 

 from the hinder end of the body, that is, between its fourth and its 

 last fifth. The male sexual aperture is situated 5 mm. in front of 

 the female, that is, at the commencement of the last third of the 

 body. The penis and the granule-gland (figs. 3 and 7) of the male 

 and the bursa copulatrix (fig. 7) of the female sexual apparatus 

 appear very peculiarly formed. The penis is a large barrel-shaped 

 muscular organ directed backwards. It passes obliquely from in 

 front and ventrally, to the posterior and upwards. On its dorsal 

 wall is a fairly deep fold. The ductus ejaculatorius, which pene- 

 trates the organ, occupies a corresponding position — passing 

 obhquely from in front and ventrally to the posterior and upwards, 

 so that its free end is directed against the dorsal body wall. This 

 position appears to me to be an artificial product, probably brought 

 about by the strongly contracted condition and the consequent 

 folding mentioned above, for the expansion of these parts would 



