2-1 Prof. M'Intosli's Notes from tie 



the rounded distal region, wliicli is tapered and ends in 

 a slight knob. 



The body is comparatively short and firm and has the 

 typical shape — enlarged in front and tapered posteriorlj'^, 

 whilst the dorsal surface is smoothly rounded to the level of 

 the ridges for the liooks^ and the ventral surface is marked 

 by a deep groove behind the scutes. Anteriorly the dorsum 

 is minutely striated transversely, and. behind the branchiae 

 it is finely tessellated after the manner of Scalibregma. 

 On the ventral surface are about twelve central sliields, 

 which are of a brighter red than the rest of the body, and 

 behind them a white median stripe (marking the nerve-cordj 

 is continued to the tip of the tail, where it blends with the 

 pale hue of the region. The first segment, with its rim 

 behind the lower lip, is whitish, and each scute has a trans- 

 verse whitish streak at its posterior border. The ridges for 

 the hooks are somewhat paler than the general surface, and 

 five of the anterior ridges have a glandular white patch 

 between them and the bristle-tufts ; indeed, each setigerous 

 process has a glandular patch in front and behind. The 

 doi'sum throughout is dull brownish, inclining to purple in 

 its native site, and merging into orange-brown near the 

 tip of the tail, at Avhich the anus is surrounded with small 

 but distinct papillse (six to eight. Be St. Josejjh). 



The branchiae are three in number on each side, the first 

 the largest and the third the least. Each arises by a short 

 stem, which divides somewhat dichotomously, but the terminal 

 divisions are both dichotomously and pinuately divided, the 

 whole having the aspect of a finely branched bush. In life 

 they have a pale whitish-pink hue. 



Two ridges run from the ventral scutes toward the first 

 branchia; but they are devoid of hooks and bristles. The 

 fiist bristle-bundle is borne by the setigerous process opposite 

 the second branchia. The pale golden bristles form two 

 groups, a shorter and a longer. The former have nearly 

 cylindrical shafts up to a slight narrowing below the wangs, 

 which are minutely serrated at the edge, followed by a 

 slight enlargement as the wings arise. After tapering con- 

 siderably the axis ends in a translucent knife-blade tip, the 

 base of which is thickened into a process representing the 

 termination of the axis, and the rest is flattened out to form 

 the terminal blade, which tapers somewhat suddenly from 

 the broad base to a fine hair-like extremity, the edge opposite 

 the process having a thickened rim, whilst the other is 

 minutely serrated. Malmgren's artist has not very accurately 

 interpreted the basal part*. 



* Annul. Polycb, tab. xiii. fig. 69 B. 



