342 THE PROCEEDINGS OF THE LINNEAN SOCIETY 



coming narrower anteriorly ; the decrease in breadth beginning in 

 front of the fifth setiferous segment. Posteriorly, the body tapers 

 away slightly after the sixteenth segment ; bat the posterior ex- 

 tremity, though narrower than the middle of the body, is rather 

 blunt than pointed. The caruncle is small, depressed, smooth, 

 and somewhat cordiform in shape. From its anterior extremity 

 arises the median tentacle, which is short and stout, and (in the 

 spirit-specimen) of a red colour. The antennas and palpi, which 

 arise from the first somatic segment, are of a similar shape and 

 colour ; the palpi being somewhat shorter than the antennae or 

 tentacle. The prestomium is mesially grooved below, but not 

 distinctly bilobed. The branchiae, which commence on the third 

 setiferous segment, are large and ramose, consisting of about four 

 main branches, arising by a common root from the dorsal 

 tubercle behind and internal to the dorsal fasciculus of setse. 

 These branches divide and subdivide — the ramifications ending 

 finally with number of slightly dilated pinnules. The main 

 branches are green in the spirit specimen, and the pinnules of 

 the same bright red hue as the antennae. The cirri, which are 

 also of a red colour, are somewhat short, the ventral series being 

 smaller than the dorsal. There are no post-anal appendages — a 

 wart-like process representing them. 



The dorsal setae are nearly colourless, long, and fairly nu- 

 merous. They consist of two distinct kinds : — one kind stouter 

 and shorter ; somewhat pointed, and possessing two rows of ser- 

 rations ; the other much finer and longer, free from serrations 

 and having near their extremity a joint or bend, from which 

 they taper, with a slight curve, to a fine distal point. The 

 ventral setae are very much shorter than the dorsal, and usually 

 only about four in number in each foot. They are stout, curved 

 at the distal end, and finely pointed, resembling, in general form, 

 the corresponding setae in A. rostrata and A. Jukesii (Baird, Mo- 

 nograph of the Amphinomaceae, Journ. Lin. Soc, vol. X., pi. IV.), 

 but having the point much more acute. These setae are dark- 

 coloured, while the dorsal are transparent. 



This species of Amphinome is the third described as occuring 

 on the Australian coast, the other two being A. rostrata, Baird, 

 and A. Jukesii Baird. 



