Gatty Marine Laboratory, St. Andrews. 121 



and it3 glandular anterior edge enshcatlis the latter. The 

 foot has moved forward so as to be eoiisiderably in front of 

 the middle of the segment, and whilst the bristle-tuft 

 remains in the lateral groove, the uncinigerous i)ad has so 

 increased in size that one half lies on the ventral surface. 

 The sixth bristled segment is fully a third longer than 

 that in front, and the foot has moved forward, lying 

 immediately behind the white glandular belt, which partly 

 enshcatlis the i)receding segment. The bristle-tuit retains 

 the same position, but the uncinigerous pad stretches furtJter 

 inward on the ventral surface, the inner edges tlius being 

 nearer. The hooks (PI. III. fig. G) in these offer no note- 

 worthy point of distinction from those of the fourth bristled 

 segment. Posteriorly tliis segment is not distinguished 

 from its successor by a glandular belt and collar, t'q^e foot 

 with its bristle-tuft and uncinigerous pad alone indicating 

 the segment, and the transverse elongation of the hcjok-pads 

 has brought their inner edges still closer. The hook-pad, 

 moreover, forms a more elevated ridge, so that the armature 

 boldly projects, and the succeeding feet show similar features, 

 though the hook-ridges gradually come nearer each other in 

 the mid-ventral line as they attain full development. The 

 specimens available for minute description were incomplete, 

 so that the exact number of bristled segments is uncertain, 

 but it probably is twenty-two or twenty-three. The last 

 two present a slight chauge, in so far as the bristle-tuft is 

 above the lateral groove, the hook-ridges are less elevated 

 and shorter, and have a larger median interval, the last being 

 separated by a larger interval than its predecessor. In these 

 the median ventral groove shows an opacjue white line, which 

 can be traced backward to the edge of the anal funnel. The 

 articulation between these short segments differs, for dorsally 

 a lozenge-shaped area at the junction is occupied by a trans- 

 versely ringed belt, which is continued ventrally. Tnese 

 segments are followed by two narrow unarmed rings without 

 the dorsal groove present in the two preceding segments, 

 but with a shallow lateral groove on each side, and the 

 opaque mid-ventral line. A constriction separates the base 

 of the funnel from the preceding, the opaque ventral line 

 j)assing into the groove aud along the funnel to terminate at 

 the mid-fissure of the two ventral cirri. The ventral outline 

 of the cup is slightly longer than the dorsal and forms a less 

 angle with the axis of the body. Each cirrus forms a low 

 cone with a terminal process or papilla, and there are fifteen 

 of nearly equal size. On the inner or posterior surface each 

 is separated from its neighbour by a line which converges to 



