Dr. Johnston 07i the Irish Annelides. 177 



ui)per one forms a helmet-shaped crest on the dorsal lobe ; 

 the mid one a large kidney-shaped leaf to the setiferoiis tu- 

 bercle ; and the other, also kidney-shaped, is attached under- 

 neath the ventral cirrus > dorsal cirrus much overreaching its 

 lobe. 



Hab. Bangor, Dr. Drummond ; (shores of the Isle of Man, Mr. Edw. 

 Forbes ; Berwick Bay, G. J.) 



Body rather flattish, about 4 inches long, very slightly 

 tapered to the tail, which is obtuse and terminated with two 

 short styles. Head distinct, obtusely triangular, pointed in 

 front with the antenna), which project beyond the palpi : eyes 

 large, occipital : proboscis armed with prickles as usual : jaws 

 chestnut-brown towards the apex, serrated with 5 denticula- 

 tions : tentacular cirri as long as, or longer than, the breadth 

 of the body : post-occipital segment rather larger than the one 

 behind: segments about 110, smooth, marked with two or 

 three rugte above the insertions of the feet, which are well-de- 

 veloped and crowded on the posterior half. Anterior feet 

 normal, with short papillary branchial lobes, of which the 

 dorsal one is the largest and most prominent. The posterior 

 feet are complicated and much unlike the others, for above 

 the base of the superior lobe there is a helmet-shaped com- 

 pressed crest ; and the superior setigerous tubercle is also 

 furnished with a very large kidney-shaped veined leaf-like 

 lamina, under which there is a small oblong lobe ; while the 

 ventral cirrus has appended beneath its base another kidney- 

 shaped leaf-like lamina, and a curved lobule on its upper side. 

 Dorsal cirrus much longer than its lobe ; that of the middle 

 feet crenated on the under side : ventral cirrus rather long. 

 Bristles slender, forming considerable brushes on the middle 

 and posterior feet : spines dark brown. 



Specimens preserved in spirits are of a uniform pearl-gray 

 colour with pale yellowish feet. 



Nereis renalis is in many respects so much like the N. lo- 

 bulata of Savigny that I have hesitated in describing them as 

 distinct species ; but the dissimilarity in the structure of the 

 feet, though apparently slight and difficult to be expressed in 

 a definition, seems to be of a kind that nothing less than spe- 

 cific origin could produce. In Nereis lobulata the leaf-like 



