6 Prof. M'liitosh's JS^oies from the 



between the hristlc-tufts. Through the translucent posterior 

 region a raoniliform alimentary canal passes backward to the 

 fissure between the caudal cones. 



The bristles, of which there are about thirty-three pairs 

 on each side, are pale, thoujih in the sun they si)ark.le with 

 metallic lustre, and are all directed forward — a feature most 

 bohlly marked in the longer anterior forms, which, moreover, 

 are arranged in a dorsal and a ventral tuft. The first 

 bristles are close to the small median cephalic area, aud 

 consist of a dorsal and a ventral series, with a clavate or 

 pear-sliaped papilla ( V\. I. tig. 8) between them. Each has 

 three sti'ong curved bristles, the stoutest with a terminal 

 curve or hook directed outward (PI. II. fig. 5 and PI. III. 

 fig. 2) aud two or three others (PI. I. fig. 7) more or less 

 hooked, but differently from the former, so that they 

 present irregularity in this respect. The first five feet have 

 the strongest bristles, those which follow have longer 

 bristles without a hook at the tip, though slightly curved. 

 The posterior bristles (PI. II. fig. 6) are shorter and more 

 slender. 



The accompanying tube (PI. II. figs. 7 & 8) is firm and 

 hard, composed of brownish grains of sand, dotted all over 

 with black particles. It is somewhat roujj;h externally, but 

 perfectly smooth internally, the mucoid lining presenting a 

 finel}' granular aspect with broken fibres and reticulated 

 structures like the tests of Diatoms and lladiolarians. The 

 innumerable broken fibres may be connected vrith Rhizo- 

 sulenia. Such may have readily collected on the mucoid 

 surface during the feeding of the animal. 



The strong simple bristles of this peculiar form recall 

 those of the Oligocha;ts or the anterior bristles of Sclerocheilus 

 — indeed, the Scalibragmidpe are characterised by the sim- 

 plicity of their bristles and the reduction of the prostomiuni ; 

 but their outline differs much from that of Fnuveliopsis, and 

 they do not dwell in tubes. Tlie bristles of this new species 

 offer, both in their structure and distribution, a rare condition 

 in the Polyclucts. The stroncrly hooked anterior forms are 

 evidently fitted for action in the soft ooze, the more slender 

 tj'pes posteriorly probably being useful during the move- 

 ments in the tube. iJereft of tentacles, as in Mi/riochele, 

 another deep-sea form, both are tubicolar. The mouth-parts 

 are akin to those of Brada, and the anterior segmentation 

 is as distinct as that of the posterior region in Trophonia. 

 ylanca, Mgrn., whilst the brittle refractive bristles approach 

 those of this family (Chlora2miil?«) in general structure, 

 though not transversely striated. Whilst it bears certain 



