TABLE B-l. EXTERNAL DIMENSIONS OF PNEUMATOPHORES* 

 Pneumatophore 



Length 

 (mm) 



Width 

 (mm) 



Volume as Prolate Spheroid 

 (mm 3 ) 



Group I* 



1 



2.50 



0.83 



0.90 



2 



3.00 



1.50 



3.52 



3 



3.80 



1.13 



4.45 



4 



2.86 



1.00 



1.50 



5 



2.46 



0.86 



1.10 



6 



3.00 



1.23 



2.35 



7 



2.90 



1.20 



2.18 



8 



2.00 



0.90 



0.84 



9 



2.63 



0.90 



1.11 Avg. 1.99 



Group II 



1 



4.40 



1.67 



6.38 



2 



3.16 



1.43 



3.36 



3 



4.00 



2.06 



8.90 



4 



3.16 



1.16 



2.22 



5 



2.70 



1.03 



1.49 



6 



3.27 



1.97 



6.63 



7 



4.40 



1.70 



6.63 



8 



2.60 



1.03 



1.44 



9 



2.73 



1.50 



3.20 



10 



2.77 



1.50 



3.25 Avg. 4.35 



These are uncorrected measurements. A discussion of suitable correc- 

 tions will be found in the main text, p. 10, dealing with measurement of 

 the float gases. 



**Groups I and II and the pneumatophore numbers coincide with those 

 given in table 2 in the main text. 



Errors (Float Volume) 



The error in reading the ocular micrometer at 27x 

 was no greater than ±0. 03 mm. This will give rise to maxi- 

 mum error in volume estimates of about 8. 5 percent for 

 the smallest volume in Group I and a minimum error of 

 about 2. 7 for the largest volume in Group II (see table B-l), 

 if both length and width are read erroneously high. The 

 maximum range of errors in volume estimate then becomes 

 about 2 to 9 percent. 



42 



