'170 ANNELIDA POLYCHAETA. 



head is blackish , with a longitudinal white band in the 

 median line, broad between the eyes and narrowing ante- 

 riorly. The superior ligules, especially in the posterior bo- 

 dy-region , show a greyish hue. The tentacular cirri of the 

 different examples vary somewhat in length ; however in 

 all of them the posterior of the right dorsal pair is the 

 longest. The feet do not present the same appearance over 

 the total length of the body , as stated by Hansen ; on 

 the contrary the superior ligule, in the anterior segments 

 only a little larger than the dorsal lobe , increases gradu- 

 ally in the posterior body-region, and near the anal ex- 

 tremity surpasses in size the total foot. However the dor- 

 sal cirrus decreases gradually in length in the posterior 

 region. 



The setose bristles are short and slender, of a vitreous 

 appearance: those of the dorsal lobe do not project beyond 

 the tip of the falcate bristles of the ventral lobe. However 

 the falcate bristles are very stout, brownish; their termi- 

 nal pieces are not »sans denticules" as stated by Hansen, 

 but beset with fine setae along the base of the concave 

 margin. Only in the posterior body-region the ventral lobe 

 seems to contain , besides the falcate bristles , one or two 

 heterogomph setose ones. Hansen's drawing of the probos- 

 cis of this species is rather correct. The paragnathi show 

 the characteristic appearance , by which , according to Kin- 

 berg's description, his genus Paravereis should be distin- 

 guished ; they consist for the greater part of pin-shaped 

 teeth with darkbrown tip (papillae pectiniformes). Group 

 I. consists of a single conical tooth , though in one spe- 

 cimen I observed another smaller one situated more poste- 

 riorly; in group II. there occurs a small patch of 3 to 4 

 succeeding transverse rows of pin-shaped paragnathi, of 

 which the external row is the longest, group IV. consists 

 of a large patch of 4 or 5 transverse rows of pin-shaped 

 teeth , of which the external row is the longest and extends 

 somewhat beyond the penultimate of them; between these 

 and the maxillae another semilunar group of large conical 



JNotes from the Leyden Museum, Vol. XI. 



