from the North Sea and adjacent parts. 



293 



alternately long and short. In life the long cirri curl up- 

 wards at the tips, and thus add grace to the a|)pcarance of 

 the animal. The short cirri jut horizontally outwards and 

 ta])cr towards the tips. The articulations arc well marked 

 and diminish in number from I). >fore l)ackward. Tlie ventral 

 cirri arc not very long, being smooth in appearance and 

 bluntly conical in outline. The feet are dried up, and 

 ideutiHcation was based chiefly on the bristles, which are 

 quite typical of the species. 



At the reproductive season, buds are developed at the 

 posterior end and become detached. They are salmon- 

 tinted, distended with ova, and are much wider than the 

 nin-se-stocks. They possess small heads, with four large 

 red eyes, only two of which are visible from the dorsum. 

 The cirri of the buds are nearly equal in length. 



Family Nereidae. 



Genus Nereis, Linnaeus, 1731. 



Nereis pelagica, Linnaeus, 1756. 



Very few specimens of this well-known and somewhat 

 common form occur in this collection, and perhaps the 

 reason is that the animals prefer a littoral to a deep-sea 

 habitat. The following were the stations where the animals 

 were obtained : — 



Several of the specimens were trawled with Hyalinopcia 

 tubicola^ O. F. M. The largest measured 3| inches long 

 and has 75 segments, hut no tube is present. From the 

 I^Ionograph this form is found " abundant in tubes under 

 stones between tide- marks on both shores of Britain and 

 L-eland ; uiulrr layers of slaty rocks, in fissures of sandstone, 

 in sandy mud, aiul under old limpets. It is less common in 



Ann. dC- Mag. N. Ilisf. Ser. 8. Vol. x'lv. 20 



