14 Prof. M'lutosli's Xotesfrom the 



The brancliiie are three in miniher on each side, and have 

 a dull red coU)nr spotted with wliite. The first pair are 

 al)out 1 in. h)n<j; in hirji^e specimens, and arise from the 

 second l)0(ly-sej;mcnt, winch lias a sj)ont-lilve fold at eacli 

 side. The main stem is ottcn nnbranchcd for some distance, 

 wliiist iu others (Uirge) a small l)ranch or two occnr close to 

 the base. The whole organ is snb-dichotomously divided, 

 the short terminal divisions giving a character to the mass, 

 which appears to form a dense ai'buscle. In many of the 

 divisions the branches spring from one side only, but this 

 docs not appear to hold in the distal divisions. The ring at 

 the base of the first branchia trends evenly away from it to the 

 frill near the external margin of the mouth. A small papilla 

 sometimes occurs close to the base of the second branchia, 

 it may be only on one side; whilst ventralward. the anterior 

 fillet of the segment has a free process like a flat papilla. 

 (Jlose to the outer base of the thiid branchia is the first 

 setigerous papilla, and a short distance ventralward is a 

 similar free flattened process to that described on the 

 previous segment. 



In young examples the brjinchise are comparatively simple, 

 though the terminal divisions correspond in general struc- 

 ture with that of the adult, and in a small littoral variety 

 from St. Peter Port, Guernsey, the branchiai are likewise less 

 bushy, though the terminal branches are ty))ical. 



The setigerous processes are seventeen in number, com- 

 mencing, as indicated, at the third branchia and continuing 

 for sixteen segments thereafter. Each is a somewhat 

 flattened papilla with the bristles arranged in a vertical row 

 in the centre. The fiist tufts of bristles are smaller, the 

 bristles theniselves shortei', but they show two groups, as in 

 the posterior, viz., a shorter series without evident wings, 

 and a longer series also without evident wings, and with 

 slightly curved and tap:red tips. In the middle of the 

 bristled region the longer pale golden bristles have stout 

 striated shatts of nearly equal diameter, and tapering tips 

 with wings. Many of th( se seem to have been broken in 

 life, and show regenerated (?) tips. The strite at the com- 

 mencement of the wings are oblique. Tlie shorter bristles 

 are more translucent, and have either no wings on the free 

 portion or very narrow ones. 



The hooks conimence on the segment behind that de- 

 scribed as having the triangular fold in a line with the last 

 branchia — that is, they occur in the segment behind the 

 branchiae. At fiist they are in a single row, but posteriorly 

 in this region they form an alternate double row along the 



