378 W. C. M'INTOSH ON BEITISH 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 antennae are small, with two brown rings at the base. The palpi are tapering and 

 quite smooth. The tentacular cirri are bi-ownish, and have a few clavate papillae. The 

 dorsal cirri are stout, brownish, and in spirit taper from base to tip. They have a very 

 few clavate papillae. 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 

 PI. LXVII. fig. 20. The superior examples in the ventral branch have an elongated, 

 tapering, spinous portion (PI. LXVII. 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 (PI. 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. 



Haemothoe sibbaldii', n. s. This species ranges from Shetland to Cornwall. At 

 first sight it appears to be a boldly marked vaiiety o{ Harmothoe imbricata; but a closer 

 inspection shows the distinction both from the latter and Parmenis IJungmani, 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 papillae. The antennae are small and brownish. The palpi are 

 brownish, with rows of small blunt papillae, which are sometimes bifid at the tip. The 

 tentacular cirri are also brownish, furnished with clavate papillae, 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. The first are small, and nearly circular, their light 

 brownish colour contrasting strongly with the succeeding. The second pair are reni- 



' Named after Dr. John Sibbnld, F.K.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. 



