14 Annals of tJie South African Museum. 



On its posterior face the septum bears numerous slender branching 

 vessels, 30 to 40 /.i in diameter, covered wholly or partly with chloro- 

 gogenous tissue. The ultimate branches of the blood-vessels end 

 blindly. The septum is apparently perforated, like that of A. marina, 

 but the apertures are difficult to see as they are masked by the felt- 

 work of blood-vessels above described. 



The setal musculature is of the usual type, except that the three 

 anterior notopodia have either no retractor or only a very short one, 

 2 mm. or so in length, which arises from the body wall just ventral 

 to the notopodium. Some of the other notopodia also have a similar 

 short retractor instead of the usual long retractor strand inserted at 

 the side of the nerve cord. 



The strap-like oblique muscles (M.OB.), which arise at the sides 

 of the nerve cord and are inserted about the level of the upper end 

 of the neuropodia, commence in the Saldanha specimens immediately 

 behind the third septum ; in the type specimens the most anterior 

 oblique muscles are in the fourth chaetigerous annulus. 



Alimentary Canal. 



The alimentary canal presents the usual regions pharynx (PH.), 

 oesophagus, stomach (ST.) and intestine. On the posterior portion 

 of the cesophagus there are two oesophageal glands (CE.GL.) more 

 or less conical in shape ; in the type specimen they are almost 

 heart-shaped, but in the Saldanha examples they are more elongate 

 cones. In the three specimens examined these glandular ceca are 

 10 to 11'5 mm. long; they open into the posterior portion of the 

 oesophagus by a tubular stalk about 2 mm. in diameter. 



Vascular System. 



The pair of hearts (H.) and the vascular system need not be 

 described in detail, they are on the same plan as the hearts and 

 vessels of A. manna. The first vessel from the gills opening into 

 the dorsal vessel is found in the twelfth segment, that is, the first 

 five gills return blood to the sub-intestinal vessel, the other eight to 

 the dorsal vessel ; in A. marina the efferent vessels of the first six 

 gills open into the sub-intestinal vessel and of the last seven gills 

 into the dorsal vessel. 



Nephridia. 



' Five pairs of nephridia are present, opening on the fifth to the 

 ninth segments. The nephridium is built on the same plan as that 

 of A. marina. The dorsal lip of the funnel is fringed with thirty 



