22s Dr. Johnston on the British Nereides. 



iiicllic ovate or elliptical, smooth, veined ; the inferior cirrus 

 short and papillary, not extending beyond the apex of the foot, 

 which is slightly emarginate and armed as usual with a brush 

 of slender jointed bristles and a single spine. 



Plate VI. fig. 7. Ph.biUneata, natural size. Fig. 8. The head. Fig. 9. 

 The middle segments; and Fig. 10. The caudal extremity: — magnified. 



4. Ph. viridis, body roundish, of a uniform grass-green co- 

 lour; branchial leaflets lanceolate ; antennae five. Plate VI. 

 tig. 11—15. 



Nereis viridis, Linn. Si/st. 1086. Mull. Zool. Dan. prod. 21 7, no. 263G. 



Fabric. Faun. Groenl. 297. Turt. Gmel. iv. 88. Turf. Brit. Faun. 



135. Adams in Linn. Trans, v. 8. Base, Vers, i. 171. Pen. Brit. 



Zool. edit. 1812, iv. 94. — Phyllodoce clavigera, Aud. et Edw. Hist. Nat. 



du JAtt. de la France, ii. 226. pi. 5 a. Jig. 9 — 13. 



Hab. Found on Fucus pimiatijidus, near Tenby (Pembrokeshire), Adams. 



Berwick Bay abundantly, and I believe it to be common on most parts of 



the British coast. 



Desc. Worm from 2 to 3 inches long, elongate and narrow, 

 slightly tapered towards the head, more so at the tail, of a 

 uniform duck-green colour, paler on the ventral aspect. Head 

 small, narrowest in front, but not pointed, the apex armed 

 with four short conical antennce, and a smaller antenna is less 

 perceptible on the vertex : eyes two *, occipital, dark brown : 

 mouth with a large clavate proboscis, greenish, rough under 

 the magnifier, with minute papillae, edentulous : post-occipital 

 segment with four tentacular cirri on each side, twice the 

 length of the branchiae, the anterior pair one half shorter than 

 the others, conical, simple : segments very numerous, often 

 defined by a line of deeper green, shorter than their breadth, 

 smooth, convex dorsally : branchial leaflets (or superior cirri) 

 lanceolate, slightly compressed, retroflexed, longer than the 

 foot, which is furnished with a bundle of very slender retract- 

 ile acicular bristles and with a single spine : tail terminated 

 with two fleshy styles, similar to the leaflets, but rather larger. 

 P. viridis lives under stones, or in the crevices of slaty 

 rocks, between tide marks; but it abounds most near low-water 

 mark, nor is it uncommon among the corallines and shells 

 that are never left uncovered by the tide. It is an active spe- 



* Audouin and Edwards say four, disposed in a transverse line, and very 

 small, but their figure shows two only. 



