6 Dr. Johnston on British AnneUdes, 



The specific name attached to this worm was suggested by the 

 resemblance it has to the Peripaius julifoiinis of the Rev. L. 

 Guilding (Zool. Jom-n. vol. ii. pi. 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 hght. The areolated structure of the 

 branchise seems to be peculiar ; and a foot bristled with papillae 

 is a very rare formation among the Annelides Errantes. 



Plate II. fig. 1. PoUicita Peripatm oii\\ensLi\xxs\s\ze. Fig. 2. The same 

 liighly 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 tlie body. Fig. 5. A single foot and branchiae 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 Eunice. 

 OnuI'his tubicola. 



Nereis tubicola, Miill. Zool. Dan. Prod. 2625. Zool. Dan. i. 18. 

 tah. l^.fig. 1—6. Turt. Gmel. iv. 87. And. and M. Edw. Litt. 

 de la France, ii. 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 Midler, 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-sinuated in front, and 

 in each sinus there originates a long awl-shaped tentaculum (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 irregular. 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 antennce (fig. 2 a a), which 

 are minute organs reminding us of the antennae of some beetles, 

 having a short moveable pedicle with a clavate head. They arise 

 from the rounded front margin. 



