Number of species 



20 30 40 



50 



Fig. 351a. Vertical distribution of Porifera species, found at a depth of more than 



2,000 m (Vinogradova). 1 Total number of species; 2 Number of species appearing 



at a given depth; 3 Number of species disappearing at a given depth. 



NUMBER OF SPECIES 

 20 39 



№ 



Ш0 



Fig. 351b. Vertical distribution of Elasipoda species, found at a depth of 

 more than 2,000 m (Vinogradova). 1 Total number of species; 2 Number 

 of species appearing at a given depth ; 3 Number of species disappearing 



at a given depth. 



