Gattij Marine Laboratory ^ St. Andrewa. \'.\ 



coiitiniKiUy moving as a scries of coin|)lcx tlireads. All are 

 deeply grooved. \\ luii the annelid is liiddeii amongst 

 shells and tul'ts of CerainUnn, the long spreading tentacles 

 resemble independent Nemcneans, and in large examples 

 stretch nearly afoot from the body. Below the mouth is a 

 transversely elongated fold, and then the broad lower lip 

 ■\vhieh ceases at the dorsal fold on each side. 



Behind the dorsal collar are a large number of dark 

 pigment-spots, the so-called eyes. These are generally con- 

 cealed by the posterior fold of the collar. In a small ^ai'iety 

 met with under stones between tide-marks at St. Peter Port, 

 Guernsey, they are both numerous and distinct, and, 

 moreover, renurn in spirit. They f(.irm, in a large Irish 

 example, a (conspicuous brown band below the collar. 



Body 9-10 inches or more in length and as thick as the 

 little finger behind the bristles, soft and mobile, with 

 numerous (60-90) narrow segments, the anterior region 

 being enlarged aiul the ])osterior tapered to a comparatively 

 large terminal anus with a crenate margin. Though the 

 dorsum, as a lule, is convex, the preparations are generally 

 marked by a slight median groove anteriorly. Ventrally, 

 a deep median groove runs from one end to the other. In 

 lai'ge exam|)les the swollen anterior end is tessellated, whilst 

 in the smaller this is less evident. 



Each segment consists of two rings, one at the bristle- 

 tuft and one in front of it doisally, and these are continued 

 ventrally, the groove in the ridge for the hooks being 

 opposite the brislle-tuft, and only a narrow space occurring 

 between them (the ridges). Posteriorly, the segments are 

 more definitely marked, the brvjader division containing the 

 lamella for the hooks, a narrow ring being in front of it. 

 Then the two rings are only indicated laterally above the 

 lamellae for the hooks, and finally, for some distance at the 

 tail, each segment is undivided, and, moreover, the segments 

 become more and more minute as they ap|)roach the last, 

 which is broader than those in front of it and has a minutely 

 crenate margin. The ventral surface in this region is con- 

 siderably diminished, whilNt the dorsal arch is increased. 

 Th(! ventral glaiulular shields are narrow and long in front, 

 broader and shorter from side to side from the filth back- 

 M-ard, and they often present a median precess laterally in 

 front of the i)oint of contact of the hook-row. They are 

 usually fourteen or Miteen in number, the anterior narrow 

 shields being ridged (two-ringed), the j)osterior flattened. 

 Occasionally an abnormality occurs in the arrangement of 

 the two rings anteriorly, the broad [)Osterior ring ceasing 

 hke a Told in the middle line. 



