POLYCILETA-BENHAM. 26 



The parapodia spring from near the anterior boundary of the segments, are short, 

 and contain but few chsetse about 6 in the anterior and 4 in the posterior feet. 



There are three kinds of chaetae (fig. 13) (a) the uppermost simple capilliform, 

 swollen at the end with a symmetrical but fine point ( this is the " aciculum " of Mclntosh) ; 

 (b) the uppermost gomphotrich, which differs from that found in E. heterosetosa, as will 

 be described below ; and (c) some four or five smaller gomphotrichs. These have, an 

 enlarged end to the shaft and articulated deep down at one side is the short bidentate 

 appendix. They are similar to those in E. heterosetosa, but have a more swollen cup. 

 The lowest chsetse have this somewhat less enlarged than the upper ones, but the 

 difference between them is not very marked. 



The uppermost gomphotrich is not " spathulate" at its extremity. It consists 

 of a slender shaft, which is much expanded at its extremity to form a large cup, which 

 when seen from the side is quadrate. Three of its sides or edges are smooth, and in the 

 re-entering angle between two of these the appendix is articulated, the fourth side 

 forming the real free end of the shaft is finely but sharply denticulate, and its face is 

 striated. The appendix is rather long, curved, and bidentate. 



When seen in the other plane that is, from the front the swollen end of the 

 shaft is oval, and the free tip of the appendix projects beyond. It has somewhat the 

 appearance of Ehlers's figure of the chaeta of E. heterosetosa (1897, pi. Ill, fig. 65), if a 

 line were drawn between the pointed tip and the oval portion ; but there are no con- 

 centric lines here in the present species. The previous authors, Mclntosh, Ehlers, 

 Gravier, have stated that this particular chaeta is " simple" and " spathulate." But 

 in a recent paper Fauvel (1919, p. 356) states that it is really a gomphotrich, i.. that it 

 bears a long and delicate appendix (" arete") which, being easily broken off, gives the 

 appearance of being simple. But, even so, the form of the cheeta in the worms before me 

 differ so much from the figures that I cannot correlate the two, hence the new species. 



It differs from E. davator Ehlers, in the absence of the chaatae with very long 

 appendices that occur in the upper part of the bundle, as well as in other characters; 

 and from E. turqueti Gravier, also in the form of the chaetse. 



The dorsal cirrus is ovate and shorter than the chsetigerous lobe ; the ventral 

 cirrus is longer, pointed, and extends beyond the lobe. 



The pharynx is lined with a dark-brown cuticle and extends through the peris- 

 tomium and three following segments to enter the barrel-shaped proventriculus, which 

 occupies 2J segments. This leads into a sub-globular region occupying the rest of the 

 7th segment, and then follows the intestine. 



Locality. ^- 



Commonwealth Bay and Macquarie Island. 



Amongst some material sorted out by Professor Haswell he noted some individuals 

 bearing young ones, which he kindly forwarded to me. The young ones are carried on 

 each side of the ventral surface just below the ventral cirri. They form a double series 

 of 8 or 9 on each side of the segments 12-20. 



S3892 D 



