218 



ON NEREIS SUCCINEA AND PERRIERI. 



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

 in the Norderney-speciinen, that in the posterior segments 

 of the body the 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. 



Pigs. 1 — 3. Parapodia of Nereis succinea, from the left side, in posterior 

 view. The numbers in brackets indicate the serial number of 

 each parapodium. 



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 to Nereis succinea, can no longer be maintained. 



Ley den Museum, November 1908. 



>Totes from the Ley den Museum, Vol. XXX. 



