NEREIS DIVBRSICOLOE. 315 



at the base, and with five to seven teeth. The paragnathi are small. Dorsally, in 

 extrusion, the proximal segment has a group of small paragnathi (VI), five to eight in 

 number, in front of each palpus. The maxillary (distal) segment bears a band (II) of 

 similar small teeth slanting obliquely outward on each side, and one or two in the middle 

 line (I). Ventrally (Plate LX, fig. 11 a) a belt of minute teeth (VII and VIII) stretches 

 from side to side of the basal division, but with a gap between it and the dorsal groups. 

 At the base of each jaw is a slightly curved belt (IV) of similar minute teeth, narrower in 

 front, broader behind, and directed nearly longitudinally. Between them is a broad belt 

 (III) of small teeth, formed in some of a series of longitudinal rows of about three teeth, 

 in others less regularly grouped. 



Fragments of peat and Alga3 occurred in the alimentary canal of one from 

 Lochmacldy. 



The first foot (Plate LXXII, fig. 5) is distinguished by the three long, acutely 

 conical lobes. Dorsally is a short cirrus, not reaching the tip of the dorsal lobe, 

 which forms in outline an isosceles triangle. There is no trace of a dorsal setigerous 

 lobe. The next lobe is fused at its base with the ventral lobe, pushing the inferior 

 setigerous lobe to the front. Both form acute cones. The ventral cirrus is short and 

 filiform. Dorsally the setigerous process bears bristles with long tapering tips, and 

 ventrally those with shorter tips, both furnished with well-marked spines. The shorter 

 bristles have a blunt hook at the tip. 



At the tenth foot a view from above shows that the second and third lobes are 

 anterior and the superior bristle-tuft posterior. The inferior setigerous lobe has its 

 larger horn posterior, the bristle-tuft being between it and the smaller anterior horn. 

 The foot thus presents an uneven outline when viewed vertically. Laterally the foot 

 shows a greatly developed dorsal lamella of a triangular outline (Plate LXXII, fig. 5 a), 

 with the short cirrus at its base. The two lobes beneath seem to be associated with 

 the superior setigerous lobe. Both project on the anterior face of the foot, the bristles 

 being behind. The bifid condition of the inferior setigerous lobe diverges from the 

 foregoing in so far as the one (smaller) lobe is anterior and the larger posterior, the 

 bristle-tuft passing out close to the former. The ventral lobe is triangular or lanceolate 

 in outline, and the ventral cirrus reaches only a little beyond its middle. The bristles 

 of the dorsal lobe all have long, tapering, and finely spinous tips (Plate LXXXI, fig. 5). 

 The upper bristles of the inferior setigerous lobe are similar in structure, and so with 

 the upper bristles of the lower tuft, whilst the lower bristles have shorter tips, with 

 spinous edges and a hook at the tip, one of those with a longer tip being shown in 

 Plate LXXXI, fig. 5 a, and one with a shorter tip in the same plate, fig. 5 b. 



The thirty-seventh foot (Plate LXXII, fig. 5 b) presents a greater elongation and a 

 more pointed condition of the superior lobe, an increase in size of the third lobe, a fusion 

 of the elements at the tip of the inferior setigerous lobe, so that the outline is simplified, 

 and a considerable diminution of the ventral lobe — formerly so conspicuous. The bristles 

 follow the same arrangement. The forms with the short tips (inferior edge of the ventral 

 series) show a differentiation of the club at the tip (Plate LXXXI, fig. 5 b). 



The posterior feet (e.g., sixty-third) diminish much in size, and there is a fusion of 

 the superior setigerous lobe with that below it. The inferior setigerous lobe is very 



