HYDROIDA II 



47 



40 



20 



200 m. _______ 6 oo m. _._._._._ 1000 m. jooom 



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

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



60 



40 



200 m. 



boom. 



._ jooom 



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. 



