POLYCH.-ETA. BENHAM. 211 



In the second foot the appendix of the gomphotrich is 

 narrower and nearly twice as long as that on the tenth foot. 



The jaws. The lower jaws have a curved anterior edge, 

 which is without denticulations. The pair are only feebly 

 connected together. The upper series consists of the usual 

 small black paragnaths, which are in three rows on each 

 side (PI. xli., fig. 65) :(a) The dorsal-most or internal row 

 consists of about 30 relatively stout, prominent, curved 

 denticles, the anterior few of which have lateral serrations 

 on each side (PI. xli., figs. 66a, 66b) ; the shape of these 

 will be understood from the figures, (b) The outer row 

 contains about twice as many denticles of much smaller 

 size ; they are straight, denticulated along both edges, 

 and overlie the bases of the internal row ; each is supported 

 by a minute rectangular plate, the series of which are set 

 close together, and form the ventral or innermost limit of 

 the series (PI. xli., fig. 66a). (c) A third row is made up of 

 about 30 two-rooted pieces, with the divergent roots directed 

 outwards, which seem to lie over the second row (PI. xli., 

 fig. 66d). 



Remarks. M'Intosh describes the species from a posterior 

 fragment measuring 11 mm. in length by 5mm. across its 

 anterior truncated end. He figures the foot (PI. xxxvi., 

 fig. 6), which differs from the hinder foot of the present 

 specimen, only in the apparently smaller size of the terminal 

 knob of the dorsal cirrus. But he says that the cirri are 

 " flattened," and as the chaetae agree, and the worm was 

 obtained in the neighbourhood of East Moncoeur Island, the 

 probability is that we have the same worm before us. 



It may be noted that Haswell 1 described a species under 

 the name Staurocephalus australis, from Port Jackson, which, 

 amongst other features, differs from 8. australiensis in the 

 proportions of the head, for the prostomium has a base 

 nearly as wide as the peristomium, and narrowing forwards 

 between the tentacles. But, as no doubt the drawing is 

 made from a freshly killed specimen, while mine is from a 

 much contracted one, the difference may be discounted to 

 some extent. However, the neuropodial chaetae are stated 

 to have an appendix which is only " obscurely notched " at 

 its apex. As the species is littoral, I hesitate to identify it 

 with M'Intosh's. 



Haswell notes that S. loveni, Kinberg, was also obtained 

 at Port Jackson in 12 fathoms, but it differs from S. australis 

 in that the palps are twice the length of the tentacles. 



1. Haswell Proc. Linn. Soc. N. S. Wales, x., 1886, p. 747. 



