l-")2 NEREIS. 



that following, the whole was much attenuated, and numerous green 

 globules were escaping from it to swim at large. When magnified con- 

 siderably, these appeared nearly spherical, solid, opaque, and environed 

 by cilia. Their motion was rapid, continuing for several days, but I 

 could not obtain any definite result. 



Possibly this Nereis may be a variety, but there is another small 

 Nereis commonly found in the clefts of rocks within flow of the tide, simply 

 green throughout, without any longitudinal rows of specks, which I can 

 scarcely hesitate to denominate the young of the Paddle Nereis. It feeds 

 readily, and a number of specimens together, will at once protrude a 

 long green proboscis on fragments of mussel, which are greedily de- 

 voured. 



PLATE XXIII. 



FIG. 1. Nereis remex The Paddle Nereis Phyllodocia laminosa. 



2. Head, enlarged. 



3. Segment, enlarged. 



4. Section of the body, giving an oblique view of the paddles. 



5. Mutilation, being part. of a specimen expected to regenerate the or- 



gan defective. 



6. Spawn. 



7. Portion of same, enlarged. 



8. NEREIS ELLIPSIS. Plate XX. Figs. 7, 8, 9, 10. 



Length two inches and half ; breadth half a line. About eleven 

 tentacular organs are in front ; four at its extremity, with a fifth some- 

 what behind them ; next, other two larger on the sides, and farther back, 

 other two pair, much larger than any of the rest. Two black eyes, be- 

 tween which the fifth frontal tentaculum originates. Body divided into 

 numerous segments. A row of elliptical organs runs down each side of the 

 body, by two of which, but much larger, the extremity terminates. 



Colour greenish to the eye. The microscope discovers two double 



