DEPARTMENT OF MARINE BIOLOGY. 



225 



Mceandra areolata (Linn). — The following table shows the decrease in growth- 

 rate of Mceandra areolata, especially after a length of about 60 mm. has been 

 attained : 



Growth-rale of Mceandra areolata. 



No. 



Location of 

 specimen. 



Date. 



Greater 

 diameter. 



Lesser diameter. 



Height. 



Remarks. 



Outside north- 

 west face Fort 

 Jefferson 

 moat-wall: 



Tile la . 



Tile lb. 



Tile Ig. 



Tile 2a. 



Tile 25. 



Tile 4b. 



Tile 4c. 



1910 

 1911 

 1912 

 1913 

 1914 

 1910 

 1911 

 1912 

 1913 

 1914 

 1910 

 1911 

 1912 

 1913 

 1914 

 1910 

 1911 

 1912 

 1913 

 1914 

 1910 



1911 



1912 



1913 



1914 



1910 

 1911 



1912 

 1913 



mm. 



9 

 21 



37. S 

 47 

 55 

 23 

 39.5 

 55 

 62 

 70 

 32 

 51 

 65 

 69 

 73-75 I 

 33 

 51 

 60 

 64 

 65 

 46 



61 



72 



80 



84 



92 

 93 



99 

 100 



(+12) 



(+16.5) 



(+9.5) 



(+8) 



(+15.5) 



( + 15.5) 



(+7) 



(+8) 



(+19) 



(+14) 



(+4) 



+4, +6) 



(+18) 

 (+9) 

 (+4) 

 (+1) 



(+15) 



(+11) 



(+8) 



(+4) 



(+1) 



(+6) 

 (+1) 



mm. 



7 



13 



17-27 



24-37 



30-43 



14 



28 



40 



mm. 



12 

 (+6) 18.5 

 (+4, +14)! 31 ( 

 (+7, +10)1 35 



(+6, +6) 



5 (+13.5) 

 ( + 11.5) 



52 



17 



35 



43 



48 



52 



22 



41 



53 



59 



63 



17. 



33. 



39 



50 



55 



58 



62 



64 



50 



54 



57 



57 



(+¥) 



41 

 17 

 20 

 31 

 31 



(+6.5) 



+ 12.5) 



(+4) 



(+6) 



(+3) 



(+11) 



(+0) 



(+18)i 32 



(+8)1 35 



(+5)1 40 



(+4)1 42 



24 



(+19)| 32 



(+12)1 38 



(+6)i 40 



(+4) 40 



5,27 



5 (+16) 



( + 12) 



(+16.5) 



(+5) 



(+¥) 



(+7) 



(+6) 



(+4) 



(+3) 

 (+0) 



June 3, 1913 



80 



(+0) 



52 



53.5 (+1.5) 



55 (+1.5) 



55 (+0) 



(+14) 

 (+3) 

 (+5) 

 (+2) 



(+8) 

 (+6) 

 (+2) 

 (+0) 



53 



40 

 40 



40 



48 



37 

 41 

 41 



44 



(+5) 



(+0) 



(+0) 

 (+8) 



(+4) 

 (+0) 



(+3) 



1 yr. old. 



2 yrs. old. 



3 yrs. old. 



4 yrs. old. 



5 yrs. old. 

 Probably 2 yrs. old. 

 Probably 3 yrs. old. 

 Probably 4 yrs. old, 

 Probably 5 yrs. old. 

 Probably 6 yrs. old. 

 Probably 3 yrs. old. 

 Probably 4 yrs. old. 



Probably 3 yrs. old. 



Probably 4 yrs. old. 



5 yrs. old. 



6 yrs. old. 



7 yrs. old. 



8 yrs. old. 



Spec, healthy lut 

 had not grown. 



Tops partly buried 

 by silt, etc.; not 

 used in comput- 

 ing averages. 



Tops partly killed 

 by silt, etc. 



Not used in com- 

 puting averages. 



Siderastrea radians (Pallas). — The following gives the diameters of two 

 colonies according to age: 



