POLYCH^ETA. BENHAM. 229 



Some of the capilliforms in the anterior feet have a flange 

 on both sides, of which one is shorter than the other. in 

 the hinder feet, however, the choeta itself is shorter and the 

 flange less extensive (PI. xliii., figs. 90, 91) The hooks have 

 one large terminal rounded tooth which does not form a 

 marked angle with the shaft ; on its back are some 5-6 very 

 small closely set denticulations separated by parallel linear 

 gaps, so as to resemble a comb (PI xliii., figs. 92, 93). The 

 shaft enlarges for a considerable distance before the end, it 

 is then suddenly narrowed below the hook so as to form a 

 deep bay. The wings are of still more considerable extent, 

 arising below the enlarged region of the shaft, and projecting 

 from the back as well as in front of the hook. 



Further details as to the feet show that the 10th foot has 

 about 20 long, upwardly curved flanged bristles terminating 

 in a fine point beyond the flange. All are alike, but those 

 above the acicula are longer (PI. xliii., fig. 94), projecting 

 beyond the tip of the posterior lip, while the lower ones do 

 little more than reach this tip. The upper ones are golden 

 brown, glistening in reflected light ; the lower are golden 

 yellow. Between the two groups are 4-5 golden acicula 

 whose points do not project beyond the skin. 



In the 55th foot the uppermost chsetae are six in number, 

 not so long as those in the anterior i'eet ; in the sub-acicular 

 bundle are five hooks and one flanged capilliform (PL xlii., 

 fig. 84). 



The acicula now have brown tips. 



In the 125th foot the supra-acicular part of the bundle 

 contains only two large upwardly directed winged hooks 

 (PI. xlii., fig. 85), below which are three flanged capilliforms. 

 differing somewhat from those anteriorly. In the sub-acicular 

 bundle are 5-6 winged hooks, of the same structure as the 

 upper ones, but slenderer. The acicula are now reduced to 

 two, which are stouter than in the anterior feet ; one is 

 golden, the other black. 



The pharynx reaches to the 10th chretigerous segment. 

 The lower jaws are brown, covered anteriorly with the usual 

 thin white transparent plate of lime, which is marked on its 

 upper surface with fine longitudinal lines, and on the under 

 surface with a number of concentric; lines ; the anterior edge 

 is white, and obliquely curved ; the pair are united for 

 nearly their whole length. The upper jawlets are black, each 

 denticle being tipped with white. The forceps, that is the 

 first pair, are relatively slender (PI. xlii., fig. 88). The right 



