﻿218 



ON NEREIS SUCCINEA AND PERRIERI. 



for, as already stated by Leuckart, it could also be observed 

 in the Norderney-specimeu, that iu the posterior segments- 

 of the body th^ dorsal cirrus is more and more reaching 

 the tip of the ligule and finally projects a good deal bey- 

 ond it. Along the inferior border of the elongated ligule 

 I observed always^ a series of dark coloured glands. 



Figs, 1 — 3. Parapodia of Rereis succinea] from the left side, in posterior 

 view. 'The numbers in brackets indicate the serial number of 

 each parapodiura. 



Fig. 4. 'A falcate bristle of the same, highly enlarged. 



Comparing the figures of parapodia, taken from a 

 Zuiderzee-specimen of N. succinea with those from N. Perrieri, 

 published by de Saint- Joseph, one will not hesitate about 

 the identity of both species. Consequently the conclusion 

 that one of our northern- Annelids should have such an 

 unusually limited geographical distribution, as hitherto is 

 ascribed io Nereis succinea, can no longer be maintained. 



Leyden Museum, November 1908. 



>rotes from the Leyden Museum, Vol. XX.X. 



