28 



ACTINARIA 



a genus-character, be- 

 cause the number varies 

 very much in several 

 species. The arrange- 

 ment of the nemathy- 

 bomes, on the other 

 hand, may as before 

 pointed out by me (1898, 

 1900) be used with 

 more success for the di- 

 stinction of both genera ; 

 in the genus Edwardsia 

 the nemathybomes are 

 arranged in 8 longitudi- 

 nal rows, in Edwardsiella 

 they are more scattered. 

 As it is on several occa- 

 sions very difficult to 

 determine the arrange- 

 ment of the nemathy- 

 bomes in preserved and 

 often strongly contracted 

 material, a strong con- 

 traction causing several 

 displacements in their re- 

 lative position, it is, how- 

 ever, for practical rea- 

 sons and in order to 

 avoid confusion, the most 

 reasonable to place to- 

 gether Edwardsia and 

 Edwardsiella in a single 

 genus Edwardsia. 



I give below a sy- 

 nopsis of the Arctic and 

 Northern Edwardsia-spe- 

 cies, examined by my- 

 self. 



Cfl 

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