170 Prof. M'lntosh's Notes from the 



6. On the Cirratulidse dredged in Norway by 

 Canon Norman, D.C.L., F.R.S. 



The northern form, Chtetozone setosa, -was first found in 

 Finmark by Malmgren and in Sweden by Loven, and it is 

 abundant in the Fjords of Norway, where it was dredged 

 by Canon Norman. The head is acutely pointed and some- 

 what triangular, with the mouth on the ventral surface a 

 short distance from the tip. The body is about an inch in 

 length, elongate-fusiform, tapering a little anteriorly and 

 more gi-adually and distinctly posteriorly, where it terminates 

 in a pointed extremity with the anus at the tip, which varies 

 in acuteness according to the condition of regeneration, 

 some being rather blunt after recent loss of segments. The 

 thickest part of the body is about the end of the anterior 

 third. It is more or less rounded throughout, with a 

 tendency, however, to dorsal and ventral flattening. The 

 segments number 70-90, and are narrow in front, but more 

 evident posteriorly fi'om the increased antero-posterior 

 diameter. The surface is greyish in the preparations and is 

 iridescent. 



The long tentacles arise on the dorso-lateral region 

 immediately behind the head, and seem to be rarely present 

 in examples caught by the dredge. They have the ventral 

 and probably ciliated groove of other forms. 



The branchiae occur in pairs, one on each side, probably 

 from fourteen to twenty in succession, and then at intervals 

 to the posterior third. They are slender filaments, those in 

 front being long and sinuous. The first bristled foot occurs 

 behind the tentacles and has a dorsal and a ventral tuft of 

 pale golden capillary bristles,with a cylindrical shaft generally 

 imbedded in the tissues, and a broader flattened serrated tip 

 which tapers to a fine point. Little difference exists in the 

 anterior region between the lengths of the dorsal and the 

 ventral bristles, but after the twentieth, or thereabout, the 

 dorsal elongate to about the diameter of the body, forming 

 glistening tufts usually carried transversely in the pre- 

 parations. Toward the posterior region stout, short, 

 crotchet-like forms appear amongst the long bristles in 

 the ventral and then in the dorsal division. They are more 

 slender in the dorsal than in the ventral, and the dorsal 

 bristles are fewer in number and more attenuate, only a brief 

 flattened part occurring beyond the skin, the rest being hair- 

 like. Moreover, the ventral bvistles present intermediate 

 forms, the shafts being three times the diameter of the ordinary 



