158 AMPHINOMIDAE. 



lately published , our systematical knowledge of this group 

 is largely advanced , not only by the description of 220 

 species new to science, but also by his detailed descriptions 

 and accurate figures of the essential parts of many little 

 known species. He rightly states in his Introduction that 

 little reliance can be placed on the description of bristles 

 etc. without accurate representations ; a good deal of the 

 species of different authors cannot be identified on account 

 of the vagueness of the figures or the total want of them. 

 Though the Leyden Museum possesses only a small col- 

 lection of Annelida , for the greatest part in an indifferent 

 state of preservation , I think it not without interest to 

 examine them carefully , as never has been done before. I 

 have begun to investigate the Amphinomidae , a family 

 about which our knowledge is very scarce , notwithstand- 

 ing Baird's Monograph ^). Prof. A. A. W. Hubrecht fa- 

 voured me also with the examination of the specimens of 

 the Utrecht Museum. 



Genus AmpUinome Bruguière. 



Amphinome rostrata Pallas. — Baird, loc. cit. p. 217, 

 pi. IV, figs, la, b. -M'Intosh, loc. cit. p. 21, pi. I, fig. 

 7; pi. IV, fig. 1; pi. Ia, fig. 16; pi. IIa, figs. 8—12. 



I had the opportunity to examine several individuals of 

 this species, belonging to the Utrecht Museum; the largest 

 of them measures 175 mm. in length and has 53 segments. 

 The characters of this species having been accurately des- 

 cribed by M'Intosh , I have not much to say about them ; 

 it may only be added that the stout serrated bristles of the 

 dorsal fascicle have not always two (as figured by M'Intosh) 

 but often three or five rows of serrations. 



In our collections there is a large specimen from the 

 Indian Ocean , presented by the Paris Museum under the 



1) Contributions towards a Monograph of the Amphinoinacea , Journ. Linn. 

 Soc. Vol. X, 1870. In this paper the litterature on the dififerent species is 

 fully quoted. 



Notes from tlie JL<eydeii ]Museum, Vol. VIXI. 



