2,6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I49 



to the proximity of sampling times, it was decided to compare the 

 numbers of living individuals in the traverses. I have previously 

 noted that binomial tests on paired samples indicate that samples 

 from the offshore area (Eggerella advena zone) give the best estimate 

 of the number of living individuals at a station. Five stations in 

 traverse 2 and seven stations in traverse 3 were in the E. advena 

 zone in November 1962. The distribution- free Wilcoxon two sample 

 test was chosen to test for significant differences in the living popula- 

 tions of the two traverses. This statistic tests for location and is 

 discussed at length by Bradley (1960). Under the null hypothesis 

 the two samples (of five and seven stations respectively) come from 

 the same population. The scores (w) of one sample and (w) of the 

 other where (m < n) are ranked, and the ranks of the smaller sample 

 are summed (R m ). The critical values of R m are tabled by Owen 

 (1962). The 95-percent level for a two-tailed test was considered 

 significant. 



A value of R m — 45 was obtained which is significant at the 95 

 percent level. There were, then, a significantly greater number of 

 living individuals in the E. advena zone of traverse 2 in November 

 1962. No attempt was made to compare traverse 4 which was sam- 

 pled in November 1961 because traverse 3 was not sampled at that 

 time and so comparisons would be unwarranted. 



Comparison of the Standing Crop with Other Areas 



In the Gulf of Maine, Phleger (1952) estimated the standing crop 

 as 30,000 per sq. m. He made this estimate by averaging the number 

 of living individuals in the top centimeter of his cores and multiplying 

 by 1,000 because the area of each sample is about one-thousandth 

 of a square meter. In L.I.S. the number of living Foraminifera, 

 estimated in the same way but from seasonal samples, is 1 10,000 per 

 sq. m. Phleger used a different staining method, and this may 

 account for some of the difference. The stations from which Phleger 

 made his estimate were almost all from depths of over 100 m., and 

 none of his stations were as shallow as the deepest station in this 

 study. It is, therefore, difficult to compare the two areas. 



At depths of less than 10 m. the living population has an average of 

 335 individuals per sample. This average is based on near-shore 

 samples taken in August and November. The greatest number of 

 living individuals (756) was found at station 112 at a depth of 

 14 m. This station is located at the entrance to Huntington Bay. 

 In New Haven Harbor at station 19 two samples taken a week apart 



