330 OBSERVATIONS ON THE CHLORAEMIDAE, 



their external characters separately. The Port Molle specimen 

 has been cut into sections ; the Darnley Island specimen remains 

 in the Macleay Museum, in the University of Sydney. 



Specimen A (that from Port Molle) has, apparently, had a 

 portion of the posterior extremity broken off. Otherwise it is 

 admirably preserved — particularly as regards the branchiae, the 

 tentacles and papilla?. Specimen B is entire as regards the seg- 

 ments ; but the praestomium has been broken off, and the 

 branchiae and tentacles are therefore lost. 



Specimen A (plate xxvi. tig. 1). — The body is sub-cylindrical, 

 tapering gradually posteriorly, the greatest breadth being at a 

 little distance behind the cephalic extremity, where there is a 

 slight dilatation. Round the latter is a circlet of sixteen very 

 large setae, which are nearly as long as the body, thick at the base, 

 finely tapering, and slightly curved towards the distal end. They 

 are marked transversely by tine transverse lines, giving them the 

 appearance of being 'composed of a number of segments. In most 

 cases there is situated close to the base of each large seta a very 

 much smaller accessory seta. All the large setae in this specimen, 

 as in the other, have attached to them numerous individuals of a 

 species of Loxosoma. 



There are twenty-six segments in the body (from which the 

 posterior portion has been broken off). The number of the 

 segments can only be reckoned by counting the bundles of setae, 

 except in the case of a few of the most posterior, which are 

 separated from one another by distinct constrictions. All the 

 segments behind the head bear setae ; but the parapodia are not 

 distinguishable. All, except the first seven, have dorsal and 

 ventral sets of setae separated from one another by a short space. 

 The dorsal setae alone are present in the first seven segments, or, 

 at least, if ventral setae are present in these segments, they do 

 not project on the surface. In the first segment (behind those 

 that bear the cephalic setae) there are four very long and very 

 fine dorsal setae, stouter and longer than those of the succeeding 

 segments, and directed forwards. The following segments, 



