POLYCH^TA-BENHAM. 45 



In the smaller individual all the prostomial appendages are present, but they 

 are absent in the larger. The median tentacle is about twice the length of the laterals; 

 they are colourless, even translucent, with an opaque white sub-terminal swelling. The 

 tentaculophores are dark-brown, as also are the peristomial cirrophores. The palp 8 

 are very long, twice the length of the median tentacle ; while the peristomial cirri are 

 as long as, or even longer than, the median tentacle. 



Although these appendages appear smooth to the naked eye, they are in reality 

 ciliate. Mclntosh states that the cilia are numerous in his specimens, but I find them 

 comparatively few and far apart. 



The parapods (fig. 39) are not very prominent, the notopod smaller than the 

 neuropod, and each has a long narrow acicular process, that of the neuropod reaching 

 further outwards, but actually the two are of equal length. 



The aciculum is colourless, very delicate, and produced into a fine point which 

 projects beyond the tip of the process in which it lies. The dorsal chsetse (fig. 40) are 

 8-10 in number, stouter than the ventrals, the upper ones curved, the lower straight. 

 The apex is short and sharply pointed, being slightly concave on one side. The whole 

 chseta is crossed by pectinated frills which only extend for about half-way across the 

 axis. 



The ventral chsetse (figs. 41-42) are long, very fine, and somewhat flexible; they 

 have a very long frilled region consisting of about 30-40 frills, and a comparatively 

 long delicate and simple apex. The upper ventrals are nearly straight ; the apex long 

 and very fine ; the rest have a curved apex rather hooked, but there is no sign of a sub- 

 terminal tooth. 



I note an opacity near the apex of the dorsal chaetee to which Mclntosh refers. 

 The ventrals differ from his figure in the much greater length of the point. 



The elytra are 15 pairs, though most of them are lacking in the specimens. The 

 two anterior elytra on each side are thin and splashed with dark sienna brown ; the 

 first one is sub-circular, the second oval (fig. 38). This has a nearly central " areola " 

 with a patch of brown pigment on its outer edge ; there are three large, broad, round- 

 tipped conical tubercles near the external margin, and springing from the surface of the 

 scale between them, but nearer to the margin, are a few long, fine, cylindrical hair-like 

 papillae. The concealed portion of the elytron bears numerous small, rounded, low, 

 and highly refringent tubercles, only visible under a high magnification. There is no 

 fringe. 



Locality. 



Station 8, 120 fathoms (one). 

 No data (the larger of the two). 



Distribution. Between Kerguelen and Heard Islands ; also Buenos Ayres 

 (Mclntosh). 



