Dr. Johnston on British Annelides. Jt 



The mouth is inferior, and so concealed that it can be seen only 

 from the ventral aspect. The wide undefined orifice is surrounded 

 by a thick lip, the upper lip being formed of two comparatively 

 large egg-shaped tubercles (fig. 2 c) ; and within the under lip 

 there are two processes like palpi. From the external side of the 



ff 



anterior tubercles there arises, on each side, a tentacular cirrus 

 (figs. 1, 2 b), similar to the tentacula in all respects, and projected 

 in the same direction, but only one-third of their length. 



The proboscis is armed with several small dark corneous jaws, 

 denticulated on the inner side, and arranged in two rows, in the 

 same way as in the genus Eunice. See Aud. and Edw. Litt. de 

 la France, pi. 3. fig. 11. 



The occipital segment has no appendages. The segment behind 

 is nearly of the same size, but those which follow are narrower, 

 the length being about one-third of the transverse diameter. 

 Above and below the foot there is a cirrus (fig. 3). On the an- 

 terior segments the superior cirrus does not project beyond the 

 foot, but it becomes considerably longer on the posterior, and is 

 simple on all of them, with a joint at the base. The foot is 

 formed of a tubercle and sheath, armed with bristles collected 

 into two fascicles. Each fascicle is furnished with a spine (fig. 4), 

 with two forceps (fig. 5), and with many lanceolate bristles curved 

 at the points (fig. 6) and very sharp, with a double edge at the 

 point of curvatare. I have not before met with a worm furnished 

 with forceps-like bristles ; and none of the kind are figured by 

 Audouin and Edwards. 



The worm lives in a tube which has a singularly exact resem- 



