44 Prof. M'liitosh's Notes from the 



axis, wliicli extends into the elongated terminal process as 

 a fine thread. The long pinnse arise in a double row, and 

 continue to the base of the terminal group, the sides of 

 which have a series of short pinnae, giving a character to 

 the organ, and which gradually diminish, leaving a smooth 

 subulate filament — much shorter than in Chone duneri and of 

 a different cliaracter — at the end of the branchia. As a trans- 

 parent object the filament presents a series of rounded areas 

 inside the chordoid axis, which probably represent the bases 

 of the pinuse. Few species show a more distinct structure of 

 these organs. 



The body is shorter and smaller than in C. fauveli, the 

 largest example being fully an inch in spirit and having 

 about fifty-five segments, of which eight bristled are anterior. 

 It is rounded tliroughout the greater part of its extent, 

 especially dorsally, and only at the posterior third is the 

 ventral surface flattened us it tapers to the tail, the tip of 

 which projects as a special process with an oblique end, the 

 slope of the anus being from above downward and forward. 

 A little pigment occurs dorsally and ventrally at the tip, 

 which in a small example had a minute filiform process, so 

 that C. filicaudata is not the only form so provided. From 

 the dorsal fissure at the collar a groove runs backward in 

 the middle line to the end of the seventh bristled segment, 

 then slants to the right across the eighth dorsally and the 

 ninth ventrally to the middle line at its posterior border, 

 and thence backward to the tip of the tail. The segments 

 show a few transverse markings, but only a few of the 

 anterior ventrally are distinctly divided into two rings. 

 The anterior region has eight bristle-tufts and seven uncini- 

 gerous rows. 



The first bristle-tuft consists of simple bristles, but the 

 second and those following in the anterior region consist of 

 two kinds — viz., a dorsal series of translucent bristles, with 

 a pale golden sheen when viewed under a lens, and long 

 tapering tips with very narrow wings, which disappear 

 before reaching the extremity, and of a spatulate ventral 

 series with cylindrical shafts, the tips of which project little 

 from the surface and end in a delicate filament. The wings 

 are at first narrow, expand into a spathulate region, then 

 gradually cease as a narrow rim on the base of the terminal 

 filament. The prolongation at the tip distinguishes this 

 bristle from the corresponding one foimd in C. fauveli. The 

 succeeding region of the body has only the narrow winged 

 tapering bristles, which, as in front, have a distinct curvature. 

 Toward the posterior cud the bristles elongate, and are 



