A.NNEUDS. I. 55 



place in this species, neither in the shape of the parapodia nor with regard to the eyes, as is well 

 known in many other Polychaets. The appearance of the long and exceeding!) delicate hairy bristles 

 seems to be the only alteration which takes place. 



Only one specimen is present from each of the above named localities; the specimen from Ice- 

 laud is stated to have been secured with the dredger, and thus there is predominant probability that this 

 specimen originates from the bottom. The specimen from Davis Strait has been dredged bv the 

 trawl, and of course there is a chance that it has been captured swimming; there is nothing to show- 

 that the form lives intermediate with its long setae, but it is a matter of course that there is a great 

 probability for such a supposition. 



In the description I shall deal with the largest of the two specimens taken by Ad. Jensen in 

 Davis Strait during his investigation voyage to Greenland with the motor-vessle "Tjalfe." 



The specimen under consideration is a mature female with eggs, as seen in fig. 17. The 

 shape of the animal is exceedingly lengthened; it measures c. 90 mm. with a breadth of only 2 mm. 

 The colour in spirit is uniform ochreous-brown. The specimen from Iceland is noticeably lighter and 

 more yellowish ; possibly this specimen is a male ; at any rate no eggs are to be seen in it; perhaps it is only 

 a question of an immature specimen, the sexual development of which has not yet finished; it is somewhat 

 smaller than the specimen secured in Davis Strait, further the number of hairy bristles in the para- 

 podium is less considerable. That the two specimens should be specifically different is not probable, 

 as the likeness is considerable and the various characteristics too peculiar. 



The cephalic lobe (PI. IV, fig. 1) is rather big, almost heart-shaped; the side-edges are convex 

 and the frontpart somewhat prominent. The four tentacles are of medium length, fusiform, and somewhat 

 flattened. The unpaired tentacle is relatively large and, as usual, situated in the hindpart of the ce- 

 phalic lobe. Two eyes are present, rather strongly pigmented; their position is in the hindpart of the 

 cephalic lobe; a straight line from the foremost border of one eye to the same part of the other will 

 touch the base of the unpaired tentacle. 



Just behind the cephalic lobe is seen a rather prominent sausage-shaped prominence; it does 

 not represent the first segment, but is situated between this and the cephalic lobe. Of the two 

 dorsal tentacular cirri on each side pertaining respectively to the second and third segment, the fore- 

 most is the longer; both are provided with a basal joint; the shape of the former is fusiform with a 

 somewhat lengthened tip. The ventral tentacular cirri are considerably shorter than the dorsal, about 

 two thirds of the length of the latter, but they are of the same shape and have a distinct basal joint (fig. 1). 



The parapodia are not very prominent. The dorsal lamella is nearly egg-shaped, somewhat 

 wry, the ventral edge being more convex than the dorsal; the latter is nearly straight or even provi- 

 ded with an insignificant concavity in the middle. The peculiar connective tissue of the lamella forms 

 a characteristic feather-shaped figure. The ventral lamella reaching nearly to the tip of the parapo- 

 diurn has a shape like that of the dorsal lamella, but is relatively more acute. 



The compound setae has a rather strong, inconspicuously curved shaft with a short clumsy 

 dilatation in the tip beset with three or four short blunt spines. The eudblade is relatively short, it 

 tapers quickly and the distal third is quite thin and delicate; one edge is finely denticulated. 



