HYDROIDA II 



47 



2 00 m. 6 oo m. looorn. 2C00 m 



Fig. XVIII. The distribution of HaUcium muricatum (forma abyssalis -+ ) in the Northern Atlantic. 

 In the hatched regions the literature notes a common, although scattered occurrence. 



. boom 



Fig. XIX. The occurrence of Halecium labrosum in the Northern Atlantic. 

 In the hatched parts the occurrence according to literature is scattered, no accurate details as to localities are given. 



