ANNELIDA POLYCHAETA. 



477 



teeth is situated ; group III. consists of 4 transverse series 

 which are faintly curved in a knee-like manner , and of which 

 the inferior one is the longest. The basal region has in group V. 

 one bluntly conical tooth and in group VI. a transverse 

 triangular ridge, whereas group VII. and VIII. show two 

 series of teeth, alternating with each other; the posterior . 

 series consists of longitudinal, narrow teeth (»dentes com- 

 pressae" Kinberg), the anterior series of stout conical ones. 

 Two specimens, described by Hansen under the name 

 of N. obscura 1 ), also belong to this species; the largest 

 of them has the anal region complete, with two long anal 

 cirri, extending about over the posterior 9 segments. The 

 superior ligule of the feet preserves his great elongation 

 till at the fifth segment in front of the anal end , poste- 

 riorly it decreases gradually in size. 



Another specimen , labelled N. coerulea Hans. 2 ) , ought 

 to be ranged also under this species ; though it wants the 

 anterior body-region , the structure of its posterior feet 

 is characteristic enough to recognize the species at once. The 

 drawing of one of the anterior feet (PI. IV, fig. 1) rather 

 well resembles our fig. 6. Hansen's statement , that the 

 terminal pieces of the falcate bristles are devoid of setae , 

 is not correct. 



Another specimen , labelled N. microphthalma 3 ) , must 

 also be identified with this species; on comparing Han- 

 sen's drawing of a foot on PI. IV, fig. 26, with his figure 

 1 , I cannot find out much difference. The specimen has 

 the dorsum of the anterior body-region reddish coloured; 

 the head shows the ordinary white longitudinal band , and 

 each segment is marked on the lateral sides of the dor- 

 sum with some white oblique lines, extending from the 

 posterior margin of the segments to the middle. In exa- 

 mining the proboscis , I found in group I. three paragnathi , 



1) loc. cit. p. 13, pi. IV, figs. 18—24. 



2) loc. cit. p. 11, pi. Ill, fig. 31, and pi. IV, figs. 1—3. 



3) loc. cit. p. 13, pi. IV, figs. 25—28. 



Notes from the Lejrden Museum, "Vol. XI. 



12 



