6 Dr. Johnston on British Annelides. 
The specific name attached to this worm was suggested by the 
resemblance it has to the Peripatus juliformis of the Rev. L. 
Guilding (Zool. Journ. vol. i. pl. 14). It is slow in its motions. 
In some positions what appeared to be a minute antenna was 
visible on the top of the head, and such as our figure represents 
it, but of its real nature I could not satisfy myself, and the ap- 
pearance may have been produced by a mere fold, or possibly by 
some refraction of the light. The areolated structure of the 
branchize seems to be peculiar ; and a foot bristled with papille 
is a very rare formation among the Annelides Errantes. 
Prate Il. fig. 1. Pollicita Peripatus of the natural size. Fig. 2. The same 
highly magnified. Fig. 3. The anterior portion of the body from below, to 
show the situation of the mouth and proboscis. Fig.4. A few segments from 
nearly the middle of the body. Fig. 5. A single foot and branchiz to show 
their structure. Fig.6. Three of the branchial globes separate from the feet. 
The figures were taken from a specimen that was only eight 
lines in length. The larger specimens were from the Irish coast. 
Family Eunicz. 
ONUPHIS TUBICOLA. 
Nereis tubicola, Miill. Zool. Dan. Prod. 2625. Zool. Dan. i. 18. 
tab. 18. fig. 1\—6. Turt. Gmel. iv. 87. Aud. and M. Edw. Litt. 
de la France, ui. 154. 
I am indebted to Mr. C. W. Peach for my specimen of this 
worm. It has lost the posterior half of the body, but what re- 
mains is in excellent preservation, and will enable us to supply 
some deficiencies in the figures and description of Miller, which 
are very good so far as they go. 
The shape of the body is similar to the Nereis, and composed 
of numerous homologous segments ; it is somewhat compressed, 
but convex or rounded on both dorsal and ventral surfaces, which 
are smooth and polished. The colour appears to have been a 
uniform yellowish-brown. 
The cephalic segment (for it can scarcely be recognised as a 
head) is very narrow, even behind, but tri-siuated in front, and 
in each sinus there originates a long awl-shaped ¢entaculum (wood - 
cut, fig. 1 a), the three being of nearly equal length. They are 
smooth but annulated, the three basal joints very distinct and 
short, the others less distinct, elongate, and rather regular. At 
the base of the tentacula are the eyes, which appear to be four in 
number, but they are so obscurely marked that the two outer 
ones may possibly be only dark spots. Underneath the tentacula 
and partly concealed by them are the antenne (fig. 2. aa), which 
are minute organs reminding us of the antennee of some beetles, 
having a short moveable pedicle with a clavate head. They arise 
from the rounded front margin. 
