126 DB. W. C. M'INTOSH ON THE ANNELIDS OF 



Ceratium divergensy Claparede and Lachmann. 

 Peridinewn Michcelais, Ehrenberg. 

 P. acuminatum, Ehrenberg. 



Dino'pliysis norwegiana, Claparede and Lachmann. 

 There are also " resting-spores " of Peridinea in reticulated cases 

 and some empty shells of Tintinnus. — E. L. M. 



On the Annelids of the British North-Polar Expedition. 

 By W. C. M'Intosh, M.D., LL.D., E.E.S., E.L.S. 



[Read November 15, 1877.] 



Captain Feilden, one of the naturalists of the late Arctic Expe- 

 dition under Sir George Nares, kindly placed in ray hands a small 

 collection of Annelids dredged between latitudes 79° and 82° 30' N. 

 In glancing over the twenty forms in this collection it is found 

 that eight species (or forty per cent.) are not mentioned in the 

 paper (recently communicated to the Society) on the Annelids 

 procured by Dr. Gwyn Jeffreys, E.R.S., when dredging in H.M.S. 

 * Valorous ' in Davis Strait. Two of these, however, are known 

 to inhabit the Gulf of St. Lawrence, where they were lately 

 dredged by Mr. Whiteaves. No species new to science is present ; 

 and, with one exception, all have been previously entered in the 

 catalogue of the Greeolandic fauna *. 



The majority of the species represented in the collection have a 

 very wide range in northern waters, many being common to the 

 British seas and the shores of the North Atlantic generally, and 

 on the American side stretching from the Gulf of St. Lawrence 

 north-eastward to the polar ice beyond Smith's Sound. With 

 two exceptions all the species occur in the seas of Spitzbergen, 

 and one of these is Icelandic, while the second is a somewhat 

 doubtful form. This distribution is therefore clearly marked ; but 

 it is well to bear in mind that the Annelids of the North- American 

 shores have been only partially investigated, and that a critical 

 revision, by one familiar with North-European forms, of what has 

 been accomplished in this respect is yet a desideratum. On the 

 whole, the circumpolar Annelidan fauna would appear to present 

 considerable uniformity in regard to species. 



* Arctic Manual. 1875. 



