NEREIS. 147 
PLATE XXI. 
Fic. 8. Section of fig. 4, enlarged. 
9. Proboscis of a middle sized specimen. 
10. Proboscis of a large specimen. 
§ 4. Nereis putLAtA—The Knob Nereis—Plate XXII. Figs. 1, 2, 3, 4, 5. 
Length above two inches ; body flattened, composed of numerous 
principal segments, with two interannulations between each ; a row of 
pencils down each side, the pencil consisting of some short hairs, issuing 
from under the knob. A small forked projection terminates the ante- 
rior extremity ; the posterior ends in two knobs. Towards the anterior 
extremity are two crescents, each consisting of two or three specks, the 
horns of the crescent turning outwards. Colour universally yellow. 
When exposed to the light, this animal wraps itself up as a crescent. 
Marine. Rare. 
Piatt XXII. 
Fic. 1. Nereis bullata. 
. Specimen, enlarged. 
3. Anterior portion, more enlarged. 
4. Posterior extremity, enlarged. 
5. Middle section, enlarged. 
§ 5. NerEIs pAaRVA.—Plate XX. Figs. 23, 24, 25. 
I speak of this animal provisionally, being ignorant whether it is 
adult. 
Five or six specimens appeared in a vessel of sea-water in September. 
Length five lines ; body slender. Antenne two, long and flexible. 
Head rather triangular, somewhat prolonged in front, on each side of 
which is a black eye’like a crescent. The body seems almost quite 
smooth, perhaps from the faintness of annulations. I could not observe 
hairs or bristles, but it terminates in two leaves. 
