Dr. Johnston on the Irish Annelides. 307 



The slight differences which may be detected between the 

 above description, drawn up from an examination of two 

 specimens of this worm, and that of Audouin and M. Ed- 

 wards, do not indicate any difference of species. The body 

 of our specimens was much more oblong, and in both of 

 them one palpus only was to be found; but the emi- 

 nent naturalists just mentioned tell us that the worm is 

 variable in form, and, though they delineate two palpi of 

 equal size, they also say that often one of them is much less 

 developed than the other. The scales are represented by 

 M. Edwards as roundish, inclining to oval : we found those 

 near the middle of the back somewhat heart-shaped, but not 

 uniformly alike, and those near the extremities were rounded. 

 When highly magnified they appeared to be striated with 

 fine lines, and were thinly sprinkled over with very minute 

 granules. 



3. Polynoe squamata, Sav. — Bangor, Dr. Drummond; 

 Strangford Lough, Messrs. Hyndman and Thompson ; coast 

 of county Down, Mr. Thompson; Belfast Bay, E. Getty, 

 Esq. — From the number of specimens it may be concluded 

 that this is a common species. 



4. Polynoe cirrata, Sav. — Belfast Bay, Messrs. Thomp- 

 son and Getty ; Strangford Lough, Messrs. Hyndman and 

 Thompson ; Bangor, Dr. Drummond ; Sligo, Mr. Hyndman. 

 The specimens are still more numerous than those of the 

 preceding, and scarcely two are alike in the colour and va- 

 riegation of the scales. 



5. Polynoe scolopendrina, Sav. — Aud. and Edw. Litt. 

 de la France, ii. p. 92. — Bangor, Dr. Drummond; coast of 

 county Down, Mr. Thompson. Plate V. 



Desc. Body linear-elongate, flattened, rounded in front 

 and slightly tapered behind, attaining a length of nearly 4 

 inches, and about 4 lines in breadth ; the anterior portion of 

 the back scaly, the posterior and larger portion naked but 

 muricated with small tubercles arranged in three rows, one 

 down the middle, and one on each side above the bases of 

 the feet : ventral surface smooth, grooved down the middle, 



