17^ Dr. Johnston on the Irish Annelides. 



feet oblique, the dorsal lobe disproportionably larger than the 

 others and more prominent, strongly humped, with a cirrus 

 twice as long ; inferior cirrus reaching to or beyond the apex 

 of its lobe. Aud. and Edw. Litt. de la France, ii. p. 188. 



Hab. Down Coast, Wm. Thompson, Esq. 



The single specimen in the collection was about 5 inches in 

 length and as thick as a large swan's quill : the colour was a 

 bkieish gray with a pearly lustre, but the feet were a dusky 

 reddish brown, and this colour had tinted the posterior half 

 of the body. Head small, the palpi projecting beyond the 

 antennae : proboscis armed as usual ; the jaws slender with 

 dark brown apices, serrulated along the whole falcate cutting 

 edge : tentacular cirri not longer than the breadth of the post- 

 occipital segment, which is nearly of the same size as the one 

 behind. Segments about 90, with well-developed feet, which 

 are more distinctly stalked than usual, and their lobes are very 

 obliquely placed in relation to each other. The dorsal lobe of 

 all the feet is largest, humped, and furnished with a cirrus 

 hanging far beyond its apex ; but on the middle and posterior 

 feet this lobe becomes greatly larger, and is raised abruptly 

 into a large hump, in front of which the cirrus originates. On 

 the posterior extremity the hump advances, so to speak, on 

 the foot, and leaves only a small papillary apex, over which 

 the long cirrus hangs. The inferior cirrus is longer than its 

 lobe. The spines and bristles present no peculiarity. 



** Feet dissimilar, the posterior with foliaceous larncllcB. 



7. N. renalis, jaws with 5 strong serratures ; proboscis 



Fig. 8. 



Nereis renalis. 

 prickly ; posterior feet with 3 foliaceous lamellae, of which the 



