64 



O 



•<9o 



56 



■^ MATRIX STATIONS 

 INDEX GROUP 6 



• COMPUTOR ASSOCIATED 

 STATIONS 



^ 



jL 



Fig. 19. Areal distribution of the northern Gulf, intermediate shelf environment, based on 



stations brought into close association by matrix-associated species, especially index group 



number 6 {Euprognatha bifida). 



butional boundaries of these species, it can be seen, correspond closely 

 to the boundaries of the environment, fig. 19. Many other species of 

 invertebrates have a similar distributional pattern in this region, even 

 though sample coverage was relatively dense from shore to 200 meters 

 (fig. 2b), which is an additional proof that a distinct assemblage and 



