ANNELIDS. I. 



J 1 



proved to be some differences between the specimens from the Trondhjems-Fjord on one side and the 

 Atlantic specimen on the other. The two from the Trondhjems-Fjord agree best with the specimens 

 sent by Dr. Nordgaard. At any rate the deviations are not so great that they will admit of the 

 establishment of a new species for the Atlantic specimen. 



In the two specimens from Drontheim the cephalic lobe shows a peculiar feature, namel) that 

 the two frontal prominences are pointing towards each other. It is a ease that I do not remember to 

 have seen in any other Polynoid (PI. Ill, fig. 8). As known, the frontal prominences usually diverge 

 in the Polynoids; I also have seem them almost parallel e.g. in H. ingolfiana (PI. II, fig. 15), but I do 

 not remember any Polynoid where they are distinctly converging, as in the species in question. 

 It concerns the two specimens from the Trondhjems-Fjord but not the Atlantic specimen; in this the 

 frontal prominences are diverging as usual in the Polynoids. (PI. Ill, fig. 6). 



In the two specimens from Drontheim the paired tentacles are of the well known cylindrical 

 shape, with an extension at the base of the terminal filament (PI. Ill, fig. 8); in the Atlantic specimen 

 the same organs are of the same thickness all 

 over, and have no extension under the terminal 

 filament, and this latter is conspicuously longer 

 than in the Drontheim-individuals. The unpaired 

 tentacle is lacking in all the 3 individuals at my dis- 

 posal. The palps are rather thick at their base 

 in all the specimens, but the terminal filament is 

 decidedly longer in the Atlantic specimen. Of 

 resemblances regarding the cephalic lobe the median 

 incision, which only reaches to the middle of the 

 head, and the position of the eyes can be pointed out. 



As to the scales I find them agreeing 

 well with the description of Storm: "oculo undo 

 glaberrima ciliis sat crassis sale microscopio modo conspicuis in superficie postica instructs, granulis 

 nonmellis minimis auuliformibus intermixtis, dorsum ut in precedente tegentia." I shall only remark 

 that the microscopical bodies which Storm characterizes as annuliform appear to me to be small 

 conical prominences, the interior cavity of which causes the bodies to appear to be excavated in the tip. 



What here is said about the scales only concerns the Drontheim-speeimens. I have figured a 

 scale from the individual from the Atlantic PI. II, fig. 5. First papillae are wanting almost entirely 

 in this scale; secondly the small conical bodies are more numerous, and spread densely over the 

 whole surface of the scale; I must add that their number varies not inconsiderably in the different 

 scales. What, meanwhile, is found in the scale of the Atlantic specimen and is not present in the 

 specimens from Drontheim, nor in the specimens lent me by Dr. Nordgaard, is a row of rather 

 large bodies along the convex edge of the scale (PI. II, fig. 5). These bodies are at any rate distinctly 

 ring-shaped; they are seen at high magnifying power in PI. II, fig. 13, where a part of the mentioned 

 edge of the elytron is figured. It is also seen that the edge is somewhat thickened, as can be seen 

 in all specimens examined by me. Some of the microscopical bodies are also seen in the same figure. 



fig. [2. 



