Miscellanea Zuoloyica. 71 



the ventral aspect, down the centre of which a blood-vessel runs from 

 one extremity to the other, of a flesh- red colour anteriorly, but 

 backwards the colour is usually a dull dirty green, with red lines 

 and dusky blotches. Head conical, pointed like a snout, pale : pro- 

 boscis very short with a lobed orifice : eyes 4, minute, placed at 

 the base of the antennae in pairs, but apparently often wanting : an- 

 tennae approximate at the base, from half to an inch in length. 

 Segments narrow, numerous ; the filaments of the anterior fringed 

 to the point with a broad membrane, those of the middle free and 

 rather long, but becoming very short on the posterior. Feet much 

 like those of the preceding, but proportionally less developed. 

 Anus stellate. 



This species inhabits our shore at lew water-mark, and is seldom 

 found with the preceding, which loves a station higher up. It is 

 rare that an entire specimen can be got, the animal breaking with 



ease into several portions, and throwing off its antennae. Plate 



II. Fig. 9. N. coniocephala of the natural size, the tail wanting. 

 The specimen was one of unusual size. JO. The proboscis. 11. 

 An antenna magnified. 12. One-half of a cross section of an ante- 

 rior segment. 13. A similar view of a segment from near the middle. 



The Spio crenaticobnis of Mo?itagu, Lin. Trans, xi. p. 199. 

 Tab. 14. fig. 6, is nearly related to this genus ; but a new exa- 

 mination of the worm is necessary to determine its true place in the 

 system. 



VI. CiRRATULus,* Lamarck. 

 Character. — Bodi/ vermiform, suhcylindrical, the segments nar- 

 row and numerous ; head small, conical, labrij'ortn, without any 

 organ of sense ; mouth itiferior, naked, emandibulate ; two or three 

 first segments apodal and naked, all the others with small papillary 

 setigerousfeet forming a double series along each side, and many of 

 them, especially the anterior, carrying dorsally long tubular tortu- 

 ous filaments ; atius dorsad, terminal, simple. 



1. C. Medusa, proper branchial filaments originating from the 



anterior margin of the 41 h segment; the posterior filaments few 



and scattered. (Plate III. Fig. 7-12.) 



Cirratulus Medusa, Johnston in Mag. Nat. Hist. vi. 124. fig. 



13 — C. fuscescens et C flavescens, Johnston in Jameson's Edin. 



Phil. Journ. xiii. 219. 



* Cirratulus — formed from cirratus, curled. 



