Gaily Marine Laboratory ^ St. Andrews. 13 



continually moving as a series of complex tlireads. All are 

 deeply giooved. When the annelid is bidden amongst 

 shells and tufts of Ceraniium, the long spieading tentacles 

 resemble independent Neuicrteans, and in large examples 

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

 transversely elongated fold, and then the broad lower lip 

 which 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. Iti a small variety 

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

 Guernsey, they are both numerous and distinct, and, 

 moreover^ remain in spirit. They form, in a large Irish 

 example, a conspicuous brown baud below the collar. 



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

 little finger behind the bristles, soft and molnle, with 

 numerous (60-90) narrow segments, the jintei'ior region 

 being enlarged and the |)osterior tapered to a comparati\ely 

 large terminal anus with a crenate margin. Though the 

 dorsum, as a rule, 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 

 large examples 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 dorsally, and these are continued 

 ventrally, the groove in the ridge for the hooks being 

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

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

 more definitely marked, the broader 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 

 lamelhe 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 mai-gin. The ventral surface in this region is con- 

 siderably diminished, whilst the dorsal arch is increased. 

 The ventral glandular shields are narrow and long in front, 

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

 ward, and they often present a median precess laterally in 

 front of the point of contact of the hook-row. They are 

 usually fourteen or fifteen in number, the anterior narrow 

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

 Occasionally an abnormality occurs in the arrangement of 

 the two rings anteriorly, the broad posterior ling ceasing 

 like a fold in the middle line. 



