22 



;3S: 



Fig. 5a. Print-out of one of the results of the computer program which listed all species taken 



as they occurred in various increments of depth, temperature, oxygen, etc. This example gives 



all species taken in between 500 and 1,000 fathoms. 



limits of common occurrences, were produced by finding out at which sta- 

 tions every species occurred with any other species. For instance, species 

 "A" may have been talcen at 30 stations, while species "B" may also have 

 been taken at 15 of the same stations, although occurred at a total of 40 

 stations. At these same 15 stations, several other species may also have 



