THE GENERA OF NEMERTEANS. 193 



NOTE XLIV. 



THE GENERA OF EUROPEAN NEMERTEANS 



CRITICALLY REVISED, WITH DESCRIPTION OF 



SEVERAL NEW SPECIES. 



BY 



Dr. A. A. W. HUBRECHT. 



During a stay at Naples in the past winter , I became 

 acquainted with a great number of Nemertini which had 

 escaped my notice on a former occasion (1874) , and of 

 which I could have numerous specimens in different varie- 

 ties thanks to the greatly improved methods of dredging 

 and searching which are now practised in Prof. Dohrn's 

 splendid establishment. 



This enabled me to gain a better insight, not only in 

 the anatomy of the group , but in the range of varieties , 

 species and genera as well. The preliminary results of 

 these researches are contained in the following pages. 



The number of genera, which at present have been in- 

 troduced into zoological literature to designate Nemerteans 

 belonging to the European fauna amounts to forty-eight. 

 The following is a list of their names, authors and dates: 



Planaria (Linn.) 0. F. Muller . . 1773. 



Fasciola , » » » 



Gordius , » > » 



Cerebratulus , Renier 1804. 



Tuhulanus , » » 



Lineus, Sowerby 1805. 



Acicula, Renier 1807. 



Borlasia, Oken 1817. 



IsTotes from the Leyden Museum. 



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