178 



PROFESSOR J. W. JUDD. 



Number of 



Depth 



Percentage of 



Percentage 



Percenta^-e of 



sample. 



ill fathoms. 



HuUtiteda. 



of Forarainifera. 



other organisms. 



1 



10 



50 



47 



3 



2 



151 



75 



23 



2 



3 



20 



99 



h 



i 



4 



23 



76 



■ 20 



4" 



5 



24 



85 



14 



1 



6 



21 



90 



9 



1 



7 



24 



85 



14 



1 



8 



26 



97 



2 



1 



■9 



25 



98 



1 



1 



10 



26 



85 



12^- 



n 



11 



25 



85 



12^ 



H 



12 



23 



98 



1 



1 



13 



26 



90 



9 



1 



14 



16 



90 



9 



1 



15 



19 



90 



9 



1 



16 



20 



90 



9 



1 



17 



12 



9 



90 



1 



18 



i 



1 



98 



1 



The samples obtained by Mr. Halligan in his important boring in the floor of the 

 lagoon, were as far as possible treated in the same way, but those from the lower 

 portion of the bore had the organisms so firmly compacted together that it was 

 impossible to separate them by picking. 



Down to the depth of 163 feet from the sea-level (62 feet below the floor of the 

 lagoon), the materials consisted of " Halimeda sand" with an admixture of 

 foraminifera and other organisms. The foraminifera consisted of Amphiscegina and 

 Heterostegina, with attached genera like Polytrema, Carpeiiteria, Sagenina, &c., and 

 an admixture of littoral forms like CalcoLvina, OrhitoUtcs, &c. 



Tlie proportions of Halimeda fronds to the foraminifera and other organisms in 

 the five samples obtained, from the up})er part of the boring, as determined by 

 picking weighed ])()rtions, is as follows : — 



Number of 

 sample. 



Depth in feet. 



Percentage of 



llalimc-ild. 



Percentage 

 of Foiaminifoa. 



Percentasj;e 



of 



other oi'ganisms. 



T7I x 1 roin Hoor of 

 Jrom suiface. , 



uigoon. 



L.l 

 L.2 

 L.3 

 L.4 

 L.5 



101 



122^ 



136^ 



151 



163 







21^^ 

 35^ 

 50 

 62 



82 



84i 



96J 



87^ 

 84.V 



15 



Hi 

 3 



lU 

 12" 



3 



i 

 1 



3^ 



Below tlie depth of 62 feet (163 feet below sea-level) the boring-tools entered a 

 mass of loosely compacted coral rock similar to that met with in the upper part of all 



