Annals of the South African Museum. 



from just below the notopodium practically to the mid-ventral line 

 (Fig. 2), where the neuropodia of the right and left sides are sepa- 

 rated from each other only by the narrow and shallow mid-ventral 

 groove.* The neuropodia are of the elongate type, like those of 

 A. marina, and differ from the short neuropodia present in A. 

 claparedii and A. assimilis. 



Nephridiopores are present in all the specimens on segments 5 to 

 9 inclusive ; the pore is immediately dorsal to the upper end of the 

 neuropodium. 



Another external feature associated with the parapodia is worthy 



of note, namely, the presence of a small, round, or oval depression, 



about '25 to - 5 mm. in diameter, immediately ventral to certain of 



the notopodia. These depressions are best seen in the type speci- 



men in which they are present, on both right and left sides, in 



segments 13 to 20 inclusive (Fig. 2;. It is interesting to note that 



the segment bearing the additional notopodium exhibits a depression 



similar to, but slightly smaller than, that of the preceding normal 



segments. These pits are also present in two of the Saldanha speci- 



mens, but on the last two or three chaetigerous segments only. Depres- 



sions identical in form and position are occasionally seen in A. cris- 



tata, but their significance is as yet unknown. Sections were made 



of a piece of the body wall between the eighteenth notopodium and 



neuropodium of one of the Saldanha specimens, but the preservation 



of the tissue is not sufficiently good to permit critical observations 



on the histology of the cells. The epidermis of the depressed area 



is composed, almost entirely, of deeply staining, narrow, columnar 



cells. Although the position of the pit reminds one of that of the 



lateral sense organs (" Seitenorgane ") of Capitellidoe and Scalibreg- 



midae, it is, at present, impossible to say if the structure in question 



is a sense organ. 



The setcB in some of the notopodia seem to be in two more or less 

 distinct series, an anterior and a posterior ; the setae of the anterior 

 row are rather shorter than those of the posterior row, but they have 

 the same form and structural detail. The setae of the ninth noto- 

 podia of one of the Saldanha examples were examined in detail. 

 The longer ones are about 6'6 to 6'8 mm. in length, the shorter ones 

 5-3 to 5-6 mm. For a distance of TO to 1-3 mm. behind the tip each 

 setae bears, along one edge, a well-marked lamina which attains a 

 breadth of 15 yu, and, as seen under medium magnification, is marked 



* The ventral and metastomial grooves are feebly marked in all the specimens. 



