NO. 1 HARTMAN : QUANTITATIVE SURVEY 149 



The Glass Sponge Association 



Another association that has been identified is characterized by the 

 presence of glass sponge. It comes only from deep water and is distributed 

 in its greatest diversity in the vicinities of low submarine mounts, and 

 along the margins of the impoverished faunal area. Its geographic extent 

 is limited by depth, since it gives rise rather rapidly to a shallow water 

 association in other parts of the Basin. The dominant groups of animals 

 are listed below, based on samples taken from the stations. The following 

 gives the sample numbers, depth in fathoms and volumetric measure- 

 ments of the samples obtained. 



