378 W. C. M‘INTOSH ON BRITISH ANNELIDA. 
The head is slightly tinted with brown. Two eyes are situated toward the posterior 
border and two on the lateral prominence in front. The tentacle is incomplete in all; 
the antenne are small, with two brown rings at the base. ‘The palpi are tapering and 
quite smooth. The tentacular cirri are brownish, and have a few clavate papille. The 
dorsal cirri are stout, brownish, and in spirit taper from base to tip. They have a very 
few clavate papille. The ventral cirri are slender and tapering, and do not reach, by 
a considerable way, the tip of the foot. 
The feet are much developed. ‘The dorsal division bears a series of slender, incon- 
spicuous, translucent bristles with a peculiar tip, which forms a kind of knob, of much 
interest when contrasted with those of the ventral branch, since it shows how closely 
the same type holds in both divisions. One of the larger bristles is represented in 
Pl. LXVII. fig. 20. ‘The superior examples in the ventral branch have an elongated, 
tapering, spinous portion (Pl. LX VII. fig. 21), with a distinct round knob at the tip. 
The shafts of all the ventral bristles are long and pale. The tips quickly shorten (from 
above downward), the claw (a modification of the knob) being quite characteristic; and 
there is a secondary process beneath (Pl. LXVII. fig. 22). Toward the inferior border 
some have no secondary process (fig. 23), but a very distinct knob at the tip, an inter- 
mediate series, of course, occurring between the first and last. 
HarmorHod stppaupr', n.s. This species ranges from Shetland to Cornwall. At 
first sight it appears to be a boldly marked variety of Harmothoé imbricata; but a closer 
inspection shows the distinction both from the latter and Parmenis ljungmani, Mgrn., a 
species which has short-tipped ventral bristles with a deep fork. It is recognized 
superficially by its somewhat firm, elongated body, and the remarkably dark (blackish) 
pigment of its anterior scales. It is about seven tenths of an inch long. 
The head is characterized by the pointed nature of the anterior lobes and by the 
position of the eyes. ‘Two of the latter are placed at the posterior border, almost 
under the fold of the first segment, and two on the under surface of the pointed 
anterior lobes, though the pigment shines through the dorsum. ‘The pairs are thus 
separated by a considerable antero-posterior interval. The tentacle has an enlarged 
basal portion, a brownish column, a pale tip with little or no enlargement beneath, and 
is covered with clavate papille. The antennz are small and brownish. ‘The palpi are 
brownish, with rows of small blunt papille, which are sometimes bifid at the tip. The 
tentacular cirri are also brownish, furnished with clavate papille, and slightly enlarged 
below the tip. The buccal cirri are brownish. The number of the bristle-hearing 
segments was thirty-seven; and the animal seemed nearly complete. 
The scales are fourteen pairs. ‘he first are small, and nearly circular, their light 
brownish colour contrasting strongly with the succeeding. The second pair are reni- 
* Named after Dr. John Sibbald, F.R.S.E., Deputy Commissioner in Lunacy, who displayed much courtesy in 
Shetland, where he happened to be visiting when the author was dredging in 1871. 
